Stock Exchange price target
"Price targets aren't set day to day, because of market fluctuations are so high from day to day. But in their stock recommendations, brokerage firms will often set price targets for ""one year out.""  These targets aren't set in stone, so use them at your risk."
"The answer depends on what is your portfolio's objective.   If you are operating a multi-asset class portfolio (i.e. your portfolio has both bonds and stocks) and are targeting absolute returns, then yes, comparing a stock's beta (or correlation) to a bond benchmark makes sense. What you do with this stock's ""bond beta"" information further depends on what kind of return profile you want your multi-asset class portfolio to have. If you want stocks that appreciate in price when bond prices decline, then of course you want to buy ""negative bond beta"" stocks.  If you are operating a purely relative equity portfolio (i.e. you are benchmarked to the stock market), then comparing the ""bond beta"" is of little use to you.  Hope this helps." You seem to think that stock exchanges are much more than they actually are. But it's right there in the name: stock exchange. It's a place where people exchange (i.e. trade) stocks, no more and no less. All it does is enable the trading (and thereby price finding). Supposedly they went into mysterious bankruptcy then what will happen to the listed companies  Absolutely nothing. They may have to use a different exchange if they're planning an IPO or stock buyback, that's all. and to the shareholder's stock who invested in companies that were listed in these markets ?  Absolutley nothing. It still belongs to them. Trades that were in progress at the moment the exchange went down might be problematic, but usually the shutdown would happen in a manner that takes care of it, and ultimately the trade either went through or it didn't (and you still have the money). It might take some time to establish this. Let's suppose I am an investor and I bought stocks from a listed company in NYSE and NYSE went into bankruptcy, even though NYSE is a unique business, meaning it doesn't have to do anything with that firm which I invested in. How would I know the stock price of that firm  Look at a different stock exchange. There are dozens even within the USA, hundreds internationally. and will I lose my purchased stocks ?  Of course not, they will still be listed as yours at your broker. In general, what will happen after that ?  People will use different stock exchanges, and some of them migth get overloaded from the additional volume. Expect some inconveniences but no huge problems. Many of the Bitcoin exchanges mimic stock exchanges, though they're much more rudimentary offering only simple buy/sell/cancel orders.  It's fairly normal for retail stock brokerage accounts to allow other sorts of more complex orders, where once a certain criteria is met, (the price falls below some $ threshold, or has a movement greater than some %) then your order is executed.  The space between the current buy order and the current sell order is the bid/ask spread, it's not really about timing.  Person X will buy at $100, person Y will sell at $102.  If both had a price set at $101, they would just transact.  Both parties think they can do a little bit better than the current offer.  The width of the bid/ask spread is not universal by any means.  The current highest buy order and the current lowest sell order, are both the current price.  The current quoted market price is generally the price of the last transaction, whether it's buy or sell. When a delisting happens, the primary process involves, the firm or the entity, trying to buy everyone out so that they can take the firm private by delisting from the stock exchanges. As the firm wants to buy everyone out, the current owners of the equity have the upper hand. They wouldn't want to sell if they believe the firm has a brighter future. So to compensate the existing holders, the buyer needs to compensate the current holders of any future loss, so they pay a premium to buy them out. Hence the prices offered will be more than the current existing price. And in anticipation of a premium the stocks price rises on this speculation. The other scenario is if the current holder(s) decide no to sell their holdings and are small in number, dependent on exchange regulations, and the buyer manages to de-list the stock, the holders might loose out i.e. they have to find another buyer who wants to buy which becomes difficult as the liquidity for the stock is very minimal. if any stock is DE-listed and then we can not trade on it,  In India if the promoters capital is more than 90%, he can get the stock de-listed. There is a process, he has to make an open offer at specified price to minority shareholders. The minority shareholder can refuse to sell. Once the stock is de-listed, it means it cannot be traded on a given exchange. However you can still sell / buy by directly finding a buyer / seller and it's difficult compared to a listed stock. "As others have noted, your definition of ""market price"" is a bit loose.  Really whatever price you get becomes the current market price.  What you usually get quoted are the current best bid and ask with the last transaction price.  For stocks that don't trade much, the last transaction price may not be representative of the current market value. Your question included regulation (""standards bureau""), and I don't think the current answers are addressing that.  In the US, the Securities and Exchange Commission (SEC) provides some regulation regarding execution price.  It goes by the designation Regulation NMS, and, very roughly, it says that each transaction has to take the best available price at the time that it is executed.  There are some subtleties, but that's the gist of it. No regulation ensures that there will be a counterparty to any transaction that you want to make.  It could happen, for example, that you have shares of some company that you're never able to sell because no one wants them. (BitCoin is the same in this regard.  There is a currently a market for BitCoin, but there's no regulation that ensures there will be a market for it tomorrow.) Outside of the US, I don't know what regulation, if any, exists." "A ""target"" school is just a school that a particular business has ""targeted"" for recruitment.  Some businesses, for example, have long histories of recruiting at certain schools, even though those schools might not be from the traditional Ivy League." The easiest route for you to go down will be to consult wikipedia, which will provide a comprehensive list of all US stock exchanges (there are plenty more than the ones you list!). Then visit the websites for those that are of interest to you, where you will find a list of holiday dates along with the trading schedule for specific products and the settlement dates where relevant. In answer to the other part of your question, yes, a stock can trade on multiple exchanges. Typically (unless you instruct otherwise), your broker will route your order to the exchange where it can be matched at the most favorable price to you at that time. R/stockmarket is probably the best.  When I have some free time I can test that strategy back as long as you would like in quantstrat, although the only problem with testing futures is joining the consolidated contracts, however I can test it with SPY as SPY returns and ES_F track very closely.