Hire a ton of staff. It's simple really. the more staff you have the more money will you make. You will get mostly one and two star staff from the regular money grabs. Focus on your high-star staff. The higher the number of stars they have, the better their starting success percentage. You get diamonds from completing achievements and from making money for the investor. Hold on to them until you get 75, and then use them to unlock a premium character (guaranteed 4 or 5 stars). There are three types of stocks that is best to buy low and sell high. Stock: Regular stocks, they go up and down like crazy and you usually get just a several coins per share. Artifact: These are the really high value goods and they are extremely expensive to buy and sell at the right time. Bond: The most unspectacular of them all but you can still make nice money on them.