The answer to your question is the study of economics. Lets say you are trying to sell Girl Scout cookies. You really want more for each box because your toop only gets to keep about 25% of the total sale price, and that’s generous. You get 25c for each because they cost about a dollar. You could sell more of them, working on a school night, or you could go to Pavillions, instead of Jons grocery, and charge 25c more per box. That would get you into a whole heap of trouble with the Girl Scout industry, your cookie supplier. So you try selling more cookies by only ordering thin mints and standing in front of Pavillions, instead of Jons.
Next year comes and GSI decides they are going to up the price of the cookies, so you are forced to up the price of each box you sell. Each box containes less cookies. They are automatically of less value, and force Jr. to cut more lawns, or get a real job that pays more, so he can afford to buy his quota of cookies to feed his facination with thin mints and little girls in uniform. Mean while, you still only get to keep 25%. Those sleeping bags at Sears have now gone up in price, forcing you and your girls to sell even more cookies, even though the sleeping bags have not gotten any warmer, and the cookie boxes now contain less cookies. Your customers start to complain. What do you do? Clean up your girls appearance and put them in shorter skirts with funky pigtails to get peoples attention, so they can sell more cookies. Its a loosing cycle, but if you don’t play the game, the girls don’t get to glue those posicle sticks together and paint ceramic gogo dolls while Mr. Jones goes out on the town with Mrs. Brown. Hmmm…
Now say those cookie boxes are actually United States currancy, the horrid dollar bill. And your objective is to earn interest by purchasing and selling stock interest in various companies, so you can take your profit and build a larger 401k or blow it in Vegas w/Mrs. Brown or Mr. Jones, depending on who you like. You want the value of that stock to go up, but sometimes it goes down, for reasons uncomprehensilbe to you, say for example when the U.S. declares war and all the taxes go to building better rifles, although better armour under the tanks might be nice. Then you find out that you can borrow stock from others who are also hoping it will go up in value, when it actually goes down. You turn around and sell it back to those people right away, at $1 a share through your broker, so they don’t figure it out. But in time, they are going to want the stock you borrowed, back. They don’t want the money, cause they are foolish and beleive in long term investment. They want their stock, so you wait a few days, then buy it back at a lower price, say 75c a share, when it drops in value, and give it back to them, keeping your 25% as profit. The kick is that you have to buy alot to make a lot of profit and you need a substantial savings account, just incase that stock goes up instead of down and you have to buy it back at $1.25 per. That darn dollar bill isn’t the profit, so printing more of it is not going to make any more profit, than making more cookies when you can only sell 200 boxes to Jr. a year. However, cutting back on the number of cookies in that box has forced Jr. to buy more boxes at a higher price and learn to flip burgers so he can move out of Mom and Dad’s and become a productive member of our society. Get it? If you don’t, go back to McDonalds and keep flipping those burgers, Jr.