If you buy something and sell it later on the same day, how do you calculate 'investment'?
Your initial investment in this case is $9 on the first morning. Every other morning you are using part of your profits to buy the new piece of jewelry, so you are actually not investing any new funds. So each day you are effectively keeping $1 of your profits and re_re-investing $9. But your initial investment of your own funds is only the first $9. In other words if you only had $9 in the bank at the start of the year you could make $365 profits during the year and finish up with $374 in the the bank at the end of the year. Not sure if your question is on topic, but the investment is only $9 because that is maximum amount of money the merchant ever needed to start up the business. He put in $9, started turning a profit, and never looked back. "Nothing wrong with the other answers, but here's a ""trick"" to hopefully make it totally transparent.   Imagine that you're not the one implementing this business plan, but someone else is.  Let's call this other person your asset manager.  So on the first day, you give your asset manager $9.  He takes this and generates $1 profit from it, recovering the $9 which he then reinvests to generate $1 profit every day.  From your perspective, you just gave him $9.  At the end of the year, he gives you $365 in addition to your original investment of $9 (in real life he'd take the fees of course, or perhaps he's been lending out the money he's been accumulating and taking the interest from that as pay for his services).  So your return on investment is 365 / 9 * 100 % > 4000 %, as claimed by your source." You're confused because the source you cite leaves out one number that isn't relevant to the argument they're making: total costs. The number you're expecting, $9 x 365 or $3285 is the total cost of buying the jewelry which, when subtracted from the $3650 sales volume gives us the net profit of $365.  The investment is the amount of money original put into a system our company. In this case the merchant bought his first piece of jewelry for $9, sold it for $10, took one dollar in profit and used the other 9 to reinvest by buying a new piece of jewelry. We can extend the analogy further. After 9 days of selling, the merchant will posses $18, allowing him to now buy 2 pieces of jewelry each morning and sell them for $20. Every day his costs will be $18 and he'll turn a $2 profit, all with the original investment of $9. Another way to look at this is if we separate the owner's account from the business's account.  At the start of the year, the owner puts $9 into the business account to get the business started. At the end of the first day, the business account has $10, and at the end of the second day, the business account has $11.  The owner doesn't need to add any more of his own money into the business account. At the end of the 365th day, the business will have $374, which is $365 profit + $9 investment.  Assuming the business has no other expenses, the business will calculate profit for the year like this: The author is making a strange point. The two numbers he is talking about are two different quantities. The business owner's return on investment is $365 / $9 = 4056%.  But the business's profit margin is $365 / $3650 = 10%.  Both are useful numbers when running the business. I disagree with the author's insinuation that a business is doing something tricky when calculating profit margin. Remember that, in addition to the business owner's monetary investment, he worked every day for a year to earn that $365.
"You can hold a wide variety of investments in your TFSA account, including stocks such as SLF. But if the stocks are being purchased via a company stock purchase plan, they are typically deposited in a regular margin account with a brokerage firm (a few companies may issue physical stock certificates but that is very rare these days). That account would not be a TFSA but you can perform what's called an ""in-kind"" transfer to move them into a TFSA that you open with either the same brokerage firm, or a different one. There will be a fee for the transfer - check with the brokerage that currently holds the stock to find out how costly that will be. Assuming the stock gained in value while you held it outside the TFSA, this transfer will result in capital gains tax that you'll have to pay when you file your taxes for the year in which the transfer occurs. The tax would be calculated by taking the value at time of transfer, minus the purchase price (or the market value at time of purchase, if your plan allowed you to buy it at a discounted price; the discounted amount will be automatically taxed by your employer). 50% of the capital gain is added to your annual income when calculating taxes owed.  Normally when you sell a stock that has lost value, you can actually get a ""capital loss"" deduction that is used to offset gains that you made in other stocks, or redeemed against capital gains tax paid in previous years, or carried forward to apply against gains in future years. However, if the stock decreased in value and you transfer it, you are not eligible to claim a capital loss. I'm not sure why you said ""TFSA for a family member"", as you cannot directly contribute to someone else's TFSA account. You can give them a gift of money or stocks, which they can deposit in their TFSA account, but that involves that extra step of gifting, and the money/stocks become their property to do with as they please. Now that I've (hopefully) answered all your questions, let me offer you some advice, as someone who also participates in an employee stock purchase plan. Holding stock in the company that you work for is a bad idea. The reason is simple: if something terrible happens to the company, their stock will plummet and at the same time they may be forced to lay off many employees. So just at the time when you lose your job and might want to sell your stock, suddenly the value of your stocks has gone way down! So you really should sell your company shares at least once a year, and then use that money to invest in your TFSA account. You also don't want to put all your eggs in one basket - you should be spreading your investment among many companies, or better yet, buy index mutual funds or ETFs which hold all the companies in a certain index. There's lots of good info about index investing available at Canadian Couch Potato. The types of investments recommended there are all possible to purchase inside a TFSA account, to shelter the growth from being taxed. EDIT: Here is an article from MoneySense that talks about transferring stocks into a TFSA. It also mentions the importance of having a diversified portfolio!" if you know when and by how much something will fluctuate, you can always make money. Buy it when it's cheaper and sell it when it's more expensive. If you just know that it fluctuated a lot recently, then you don't know what it will do next. Most securities that go to zero or go much higher bounce all over the place for a while first.  But you don't know when they'll move decisively lower or higher.  So how could you figure out if you'll make money - you can't know. DCA will on average make you better off, unless the extra commissions are too high relative to your purchase sizes. But it will in retrospect make you worse off in many particular cases. This is true of many investment disciplines, such as rebalancing. They are all based on averages.  If the volatility is random then on average you can buy more shares when the price is lower using DCA. But when the lowest price turns out to have been on a certain day, you'd have been better off with a single lump sum put in on that day. No way to know in advance.  Degree of volatility shouldn't matter; any fluctuation is enough for DCA or rebalancing to get you ahead, though it's true they get you ahead farther if the fluctuations are larger, since there's then more difference between DCA and a lump purchase.  I think the real reason to do DCA and rebalancing is risk control. They reduce the risk of putting a whole lump sum in on exactly the wrong day. And they can help keep a portfolio growing even if the market is stagnant. "First, you are not exactly ""giving"" the brokerage $2000. That money is the margin requirement to protect them in the case the stock price rises. If you short 200 shares as in your example and they are holding $6000 from you then they are protected in the event of the stock price increasing to $30/share. Sometime before it gets there the brokerage will require you to deposit more money or they will cover your position by repurchasing the shares for your account. The way you make money on the short sale is if the stock price declines. It is a buy low sell high idea but in reverse. If you believe that prices are going to drop then you could sell now when it is high and buy back later when it is lower. In your example, you are selling 200 shares at $20 and later, buying those at $19. Thus, your profit is $200, not counting any interest or fees you have paid. It's a bit confusing because you are selling something you'll buy in the future. Selling short is usually considered quite risky as your gain is limited to the amount that you sold at initially (if I sell at $20/share the most I can make is if the stock declines to $0).  Your potential to lose is unlimited in theory. There is no limit to how high the stock could go in theory so I could end up buying it back at an infinitely high price. Neither of these extremes are likely but they do show the limits of your potential gain and loss.  I used $20/share for simplicity assuming you are shorting with a market order vs a limit order. If you are shorting it would be better for you to sell at 20 instead of 19 anyway. If someone says I would like to give you $20 for that item you are selling you aren't likely to tell them ""no, I'd really only like $19 for it""" "Price is current price per share, but you can buy fractional shares. Minimal investment is how later the first purchase of shares must be to make it worth their efforts to set up the account for you. How you manage it is up to you. You can buy or sell shares at any time, pretty much, though it may take a few days for the transaction to ""settle"" and take effect. You can do this via checks, or you can give the broker (or the investment house, if you are dealing directly with them as I do) permission to take money from or put money to your bank account when you tell them you want to buy or sell shares. You may be able to set up direct deposit; talk to your employer about that. Or you may be able to have your bank make a periodic transfer/purchase for you." Mutual funds are collections of investments that other people pay to join.  It would be simpler to calculate the value of all these investments at one time each day, and then to deem that any purchases or sales happen at that price.  The fund diversifies rather than magnifies risk, looking to hold rather than enjoy a quick turnaround.  Nobody really needs hourly updated price information for an investment they intend to hold for decades. They quote their prices on a daily basis and you take the daily price.  This makes sense for a vehicle that is a balanced collection of many different assets, most of which will have varying prices over the course a day.  That makes pricing complicated.  This primer explains mutual fund pricing and the requirements of the Investment Company Act of 1940, which mandates daily price reporting.  It also illustrates the complexity: How does the fund pricing process work? Mutual fund pricing is an intensive process that takes place in a short time frame at the end of the day. Generally, a fund’s pricing process begins at the close of the New York Stock Exchange, normally 4 p.m. Eastern time. The fund’s accounting agent, which may be an affiliated entity such as the fund’s adviser, or a third-party servicer such as the fund’s administrator or custodian bank, is usually responsible for calculating the share price. The accounting agent obtains prices for the fund’s securities from pricing services and directly from brokers. Pricing services collect securities prices from exchanges, brokers, and other sources and then transmit them to the fund’s accounting agent. Fund accounting agents internally validate the prices received by subjecting them to various control procedures. For example, depending on the nature and extent of its holdings, a fund may use one or more pricing services to ensure accuracy. Note that under Rule 22c-1 forward pricing, fund shareholders receive the next daily price, not the last daily price.  Forward pricing makes sense if you want shareholders to get the most accurate sale or purchase price, but not if you want purchasers and sellers to be able to make precise calculations about gains and losses (how can you be precise if the price won't be known until after you buy or sell?). "According to the IRS, you must have written confirmation from your broker ""or other agent"" whenever you sell shares using a method other than FIFO: Specific share identification.   If you adequately identify the shares   you sold, you can use the adjusted basis of those particular shares to   figure your gain or loss. You will adequately identify your mutual fund shares, even if you   bought the shares in different lots at various prices and times, if   you: Specify to your broker or other agent the particular shares to be sold or transferred at the time of the sale or transfer, and Receive confirmation in writing from your broker or other agent within a reasonable time of your specification of the particular   shares sold or transferred. If you don't have a stockbroker, I'm not sure how you even got the shares. If you have an actual stock certificate, then you are selling very specific shares and the purchase date corresponds to the purchase date of those shares represented on the certificate." "Their algorithm may be different (and proprietary), but how I would to it is to assume that daily changes in the stock are distributed normally (meaning the probability distribution is a ""bell curve"" - the green area in your chart).  I would then calculate the average and standard deviation (volatility) of historical returns to determine the center and width of the bell curve (calibrating it to expected returns and implied volaility based on option prices), then use standard formulas for lognormal distributions to calculate the probability of the price exceeding the strike price. So there are many assumptions involved, and in the end it's just a probability, so there's no way to know if it's right or wrong - either the stock will cross the strike or it won't." "This is a misconception. One of the explanations is that if you buy at the ask price and want   to sell it right away, you can only sell at the bid price. This is incorrect. There are no two separate bid and ask prices. The price you buy (your ""bid"") is the same price someone else sells (their ""sell""). The same goes when you sell - the price you sell at is the price someone else buys. There's no spread with stocks. Emphasized it on purpose, because many people (especially those who gamble on stock exchange without knowing what they're doing) don't understand how the stock market works. On the stock exchange, the transaction price is the match between the bid price and the ask price. Thus, on any given transaction, bid always equals ask. There's no spread. There is spread with commodities (if you buy it directly, especially), contracts, mutual funds and other kinds of brokered transactions that go through a third party. The difference (spread) is that third party's fee for assuming part of the risk in the transaction, and is indeed added to your cost (indirectly, in the way you described). These transactions don't go directly between a seller and a buyer. For example, there's no buyer when you redeem some of your mutual fund - the fund pays you money. So the fund assumes certain risk, which is why there's a spread in the prices to invest and to redeem. Similarly with commodities: when you buy a gold bar - you buy it from a dealer, who needs to keep a stock. Thus, the dealer will not buy from you at the same price: there's a premium on sale and a discount on buy, which is a spread, to compensate the dealer for the risk of keeping a stock."