Is there a way to take advantage of nice numbers?
You'd need millions of dollars to trade the number of shares it would take to profit from these penny variations.  What you bring up here is the way high frequency firms front-run trades and profit on these pennies. Say you have a trade commission of $5.  Every time you buy you pay $5, every time you sell you pay $5.  So you need a gain in excess of $10, a 10% gain on $100.  Now if you wanted to trade on a penny movement from $100 to $100.01, you need to have bought 1,000 shares totaling $100,000 for the $0.01 price movement to cover your commission costs.  If you had $1,000,000 to put at risk, that $0.01 price movement would net you $90 after commission, $10,000,000 would have made you $990.  You need much larger gains at the retail level because commissions will equate to a significant percentage of the money you're investing. Very large trading entities have much different arrangements and costs with the exchanges.  They might not pay a fee on each transaction but something that more closely resembles a subscription fee, and costs something that more closely resembles a house. Now to your point, catching these price movements and profiting.  The way high frequency trading firms purportedly make money relates to having a very low latency network connection to a particular exchange.  Their very low latency/very fast network connection lets them see orders and transact orders before other parties.   Say some stock has an ask at $101 x 1,000 shares.  The next depth is $101.10.  You see a market buy order come in for 1,000 shares and place a buy order for 1,000 shares at $101 which hits the exchange first, then immediately place a sell order at $101.09, changing the ask from $101.00 to $101.09 and selling in to the market order for a gain of $0.09 per share.
We don't have all the relevant numbers to give you the perfect answer. Knowing your income is pretty important for this question, but, since you have 200K in student loans, I'm going to guess (and hope) you probably make more than 80K/yr which is the cutoff for deducting student loan interest. (It starts phasing out once you make over 65K and fully phases out at 80K, or 160K if you're married.) Even if you make less than 65K, you can only deduct a max of 2500/yr in student loan interest and you'll be maxing that out for at least the next 4 years. So, my take is: Throw it at the student loan. Your mortgage interest is (probably) fully deductible, which means your mortgage interest rate is effectively reduced by your tax bracket. E.g. if you are in the 28% tax bracket a 4% mortgage rate would effectively become 2.88%. Outside of that, if you were to make minimum payments on your mortgage and student loans starting now, as soon as your student loan is paid off I would start making that same student loan payment amount towards your mortgage. This way you won't have any change in cash flow, but it will significantly lower the term of your mortgage. (Which is what would happen if you choose to pay down the mortgage now, but then you don't get the tax advantage on the difference.) "From what I've read, paying down your mortgage -- above and beyond what you'd normally pay -- is indeed an investment but a very poor form of investment. In other words, you could take that extra money you'd apply towards your mortgage and put it in something that has a much higher rate of return than a house. As an extreme example, consider: if I took $6k extra I would have paid toward my mortgage in a single year, and bought a nice performing stock, I could see returns of 2x or 3x. Now, that implies I know which stock to pick, etcetera.. I found a ""mortgage or investment"" calculator which could be of use as well: http://www.planningtips.com/cgi-bin/prepay_v_invest.pl (scroll to bottom to see the summary and whether or not prepay or invest wins for the numbers you plugged in)" "All life insurance is pretty much the same when it comes to cost. You can run the numbers over certain time period and the actual cost of insurance is about the same. A simplified way to explain life insurance and the differences between them below: The 3 characteristics of life insurance: There are 5 popular types of life insurance and they are: Term Whole Life Universal Life Variable Universal Life Indexed Universal Life But first, one must understand the most basic life insurance which is called Annual Renewable Term:  This is a policy that covers 1 year and is renewable every year after. The cost of insurance typically increases each year as the insured ages. So for every year of coverage, your premium increases like in the simplified illustration above. This is the building block of all life insurance, term or permanent. There is no cash value; all premium goes to the cost of insurance.  This is an ART that spans over a longer time period than 1 year (say 5, 10, 15, 20 or 30 years). All the cost is added together then divided by the number of years of coverage to give a level premium payment for the duration of the policy. The longest coverage offered these days is 30 years. There is no cash value; all premium goes to the cost of insurance. The premium is fixed (level) for the term specified. If the policy comes to an end and the owner wishes to renew it, it will be at higher premium. This can be seen in the simplified illustration above for a 15-year term policy.  Because life insurance gets very expensive as you reach old age, life insurance companies came up with a way to make it affordable for the consumer wishing to have coverage for their entire lifespan. They allow you to have interest rate crediting on the cash value account inside the policy.  To have cash value in the first place, you must pay premiums that are more than the cost of insurance. The idea is: your cash value grows over time to help pay for the cost of insurance in the later stages of the policy, where the cost of insurance is typically higher. This is illustrated above in an overly simplified way. This is a permanent life insurance policy that is designed to cover the lifespan of the insured. There is cash value that is credited on a fixed interest rate specified by the insurance company (typically 3-5%). The premium is fixed for the life of the policy. It was designed for insuring the entire lifespan of the insured. This is variation of Whole Life. There is cash value; it is credited on a fixed interest rate specified by the insurance company, but it does fluctuate year to year depending on the economy (typically 3-6%). The premium is flexible; you can increase/decrease the premium.  This is basically a universal life policy, but the cash value sits in an account that is invested in the market, normally mutual funds. Your interest that is being credited (to your account with your cash value from investments) is subjected to risk in the market, rise/fall with the market depending on the portfolio of your choosing, hence the word ""Variable"". You take on the risk instead of the insurance company. It can be a very good product if the owner knows how to manage it (just like any other investment products). This is a hybrid of the UL and the VUL. The interest rate depends on the performance of a market index or a set of market indices. The insurance company states a maximum interest rate (or cap) you can earn up to and a guaranteed minimum floor on your cash value interest that will be credited (typically 0% floor and 12% cap). It is purely a method to credit you interest rate. It takes the market risk out of the equation but still retains some of the growth potential of the market. Term policy is designed for temporary coverage. There is no cash value accumulation. Permanent policies such as whole life, universal life, variable universal life and indexed universal life have a cash value accumulation component that was originally designed to help pay for the cost of insurance in the later stages of the policy when the insured is at an advanced age, so it can cover the entire lifespan of the insured. People do take advantage of that cash value component and its tax advantages for retirement income supplement and maximize the premium contribution. Always remember that life insurance is a life insurance product, and not an investment vehicle. There is a cost of insurance that you are paying for. But if you have life insurance needs, you might as well take advantage of the cash value accumulation, deferred tax growth, and tax-free access that these permanent policies offer." There are hundreds of entities which offer mutual funds - too many to adequately address here. If you need to pick one, just go with Vanguard for the low low low fees. Yes, this is important. A typical expense ratio of 1% may not sound like much until you realize that the annualized real rate of return on the stock market - after inflation - is about 4%... so the fund eats a quarter of your earnings. (Vanguard's typical expense ratios are closer to 0.1-0.2%). If your company offers a tax-deferred retirement account such as a 401(k), you'll probably find it advantageous to use whatever funds that plan offers just to get the tax advantage, and roll over the account to a cheaper provider when you change employers. You can also buy mutual funds and exchange-traded funds (ETFs) through most brokerages. E*Trade has a nice mutual fund screener, with over 6700 mutual funds and 1180 ETFs. Charles Schwab has one you can browse without even having an account. Basically, diversifying narrows the spread of possible results, raising  the center of the returns bell-curve by reducing the likelihood of extreme results at either the high or low end.  It's largely a matter of basic statistics. Bet double-or-nothing on a single coin flip, and those are the only possible results, and your odds of a disaster (losing most or all of the money) are 50%. Bet half of it on each of two coin flips, and your odds of losing are reduced to 25% at the cost of reducing your odds of winning to 25%, with 50% odds that you retain your money and can try the game again. Three coins divides the space further; the extremes are reduced to 12.5% each, with the middle being most likely. If that was all there was, this would be a zero-sum game and pure gambling. But the stock market is actually positive-sum, since companies are delivering part of their profits to their stockholder owners. This moves the center of the bell curve up a bit from break-even, historically to about +8%. This is why index funds produce a profit with very little active decision; they treat the variation as mostly random (which seems to work statistically) and just try to capture average results of a (hopefully) slightly above-average bucket of stocks and/or bonds. This approach is boring. It will never double your money overnight. On the other hand, it will never wipe you out overnight. If you have patience and are willing to let compound interest work for you, and trust that most market swings regress to the mean in the long run, it quietly builds your savings while not driving you crazy worrying about it. If all you are looking for is better return than the banks, and you have a reasonable amount of time before you need to pull the funds out, it's one of the more reliably predictable risk/reward trade-off points. You may want to refine this by biasing the mix of what you're holding. The simplest adjustment is how much you keep in each of several major investment categories. Large cap stocks, small cap stocks, bonds, and real estate (in the form of REITs) each have different baseline risk/return curves, and move in different ways in response to news, so maintaining a selected ratio between these buckets and adding the resulting curves together is one simple way to make fairly predictable adjustments to the width (and centerline) of the total bell curve. If you think you can do better than this, go for it. But index funds have been outperforming professionally managed funds (after the management fees are accounted for), and unless you are interested in spending a lot of time researching and playing with your money the odds of your doing much better aren't great unless you're willing to risk doing much worse. For me, boring is good. I want my savings to work for me rather than the other way around, and I don't consider the market at all interesting as a game. Others will feel differently. If you budget for cloths and save up the money, you may be able to take advantage of sales when they are on.   However only buy what you will use! You need to ask yourself what value you put on cloths compared to other things you can spend the money on.   Also would you rather have money in the bank encase you need it rather than lots of cloths in the wardrobe? That's up to you. If you instruct your broker to sell shares purchased in specific lots, they can do that -- but doing so requires that you and/or they track specific fractional lots forever afterwards so you know what is still there to be sold. FIFO simplifies the bookkeeping. And I am not convinced selecting specific lots makes much difference; the government gets its share of your profits sooner or later. The short answer is yes, it is possible to do what these classes claim, however, it is highly unlikely. For every person they can show you that got rich using whatever so called method they are teaching, there are hundreds of people that didn't that they aren't telling you about. What I would recommend is invest in a well diversified portfolio. If you have a higher tolerance for risk then you can make some of that portfolio out of higher risk/reward investments. Maybe you pick the next Apple or Google or Netflix or whatever but that portion of your portfolio should be money that you can afford to lose in case you pick duds.