accounting profits Following the "mad" foreign policy, for example, Mr Trump could go to war with north Korea or Iran. Or he could publish more inflammatory tweets about Islam's wickedness, which would allow individuals to be disrupted and marginalised into the arms of the islamic state (Isis) or other extremist groups. That would increase the likelihood of attacks on Isis, such as the "lone Wolf" in the United States, boasting or driving trucks in its own pedestrian area. There are a dozen people, and if not hundreds of people, the slain trump can wrap himself in the flag and say, "I told you so." If things get bad, trump and his generals can declare a state of emergency, suspend civil liberties and transform the United States into a truly populist state of Pluto. Economic profits in perfect competition and monopolistic competition market has a special purpose, a positive profit can attract more enterprises to enter the market, increasing competition and push the market equilibrium price low, exclude some enterprises lack of competitiveness in the market, to achieve long-term equilibrium; On the contrary, negative economic profit can eliminate some of the original enterprises in the market, because the supply is reduced, the market equilibrium price will be pushed up, and the long-term equilibrium will be achieved. The result of the two cases is that economic profits disappear from each manufacturer and the manufacturer's total income is at the lowest point of average cost. (3) monetary benefits -- increase the monetary value of assets. There are both measurable and unquantifiable benefits in these three different forms of income. Among them: mental income is too strong to measure, monetary gain is easy to measure because of the static concept of value change. Economists, therefore, focus only on actual earnings. It looks like a big box and has doors and Windows, which people call "box cars". It is named "sedan" in the catalog because it looks like the "sedan chair" of the European ladies used for travel and other occasions.