Cheat mode
Type in one of the codes below while playing to activate the desired cheat.

Easier money (demo version)
Switch the game speed to "Frozen". Issue as many shares as possible without changing the price. Build however many department stores as you like, but keep a couple of million dollars for safekeeping. Make the top row of the layout purchasing units, the middle row the sale units, and the middle of the last row an advertising unit. Start buying (in order on layout) the computer, sweater, and bread. Set the game speed to the fastest setting, then wait for the popularity of the items to go up, and then freeze the game. Put the prices as high as you can, which will probably be as high as $2 billion. Buy as much stock in your company as you can without going below a million dollars left in company cash. Set the game speed to the fastest setting and you should end up with more than $2 trillion. Issue as much stock as you like, then buy out all the other companies until there literally are none left but yours. Buy as much stock in your company with your company cash and sell it all. You should end up with a personal wealth of in the billions of dollars.