Entrepreneurs are businessmen, they create employment, pay taxes, most often than not they start something new in the market which stimulates the economy. Like new stuffs to franchise and then it becomes a multiplier, some other businessmen now have other business opportunities. New entrepreneurs are given more choices in terms of what business to get in to. all of which helps the economy somehow. Interests is how much people/businesses are willing to pay for the cost of money. Profit, without profit there is no use in continuing a business. Why do business without profit? When it is outright crazy and unreasonable that is too much. It's not easy to quantify how much and it's relative depending on the individual.