how to find economic profit Interest determines the regularity of prescriptive (interest this qualitative rules will determine the amount of the rules), the amount of interest depends on profit, interest rate depends on the average profit margin. Marx further pointed out that, between average profit margin and zero, interest rate depends on two factors: one is profit margin; The second is the proportion of total profits allocated between lenders and borrowers. The right to promote and protect the free exchange of values between the two parties - the exchange of freedom is crucial to the participation of the future world. It is equivalent to freedom of speech in digital space. This is about equality and must be protected and seen as a human right. The taboo of to not eat eggs with soya-bean milk is regarded as the popular about soya-bean milk. There are two reasons for the statement: you are the trypsin in soya-bean milk can inhibit protein digestion, to cut back nutrition value"; second is the eggs in the sticky protein and trypsin in soymilk is combined, to make material stop digested, and help reduce nutrition value ". But the DRAM and NAND semiconductor industries have gone from boom to bust in the face of rising prices and the abundance of falling prices. Will it be any different this time? Or is the need for mobile device memory and disk replacement sufficient to continue to delay the abundance until the foreseeable future?