The spread betting companies make the rules

If you buy shares with the purpose of holding them for a relatively short period of time and then selling them, you will be engaging in the activity known as trading. The trader is set apart from the type of person who buys shares with the intention of holding them for a long period, perhaps forever, with the expectation of benefiting over a long period by having an income from dividends with a large capital gain in many years time.As a trader, you will only have to worry about what the market does. There are very clear definitions of what you can expect to get when you decide to open or close your position. True, you will have a spread to contend with (the price at which you can buy from the market maker will not be the same at a given instant in time as the price at which he will buy from you) but this will be, to a large extent, transparent to the normal trader in a market with normal liquidity.You will, in effect, be pitted against, and find yourself interacting with, the great body of other traders who are interested in the same securities as yourself. The market will dictate the outcome, for better or worse.When you start dealing in equity or index options, the position changes. The spread then becomes a significant item, and you will be up against option contract expiry dates, as well as the market as a whole, but at least you are still dealing in a real market, unlike in spread betting.