Factors that generate interest
1. Time preference: Because the loan will make the lender have to delay the use of part of the money, people usually prefer the goods now rather than delayed, so there will be interest;
2. Inflation expectation: As the economy itself is bound to experience inflation, in order to offset the impact of inflation, loan interest is used to make up for it;
3. Alternative investment: the lender's borrowing is equivalent to losing other investment opportunities, so it charges a certain interest, not other investments;
4. Investment risk: If the borrower goes bankrupt, the borrower can get some compensation through interest;
5. Liquidity preference: People prefer assets with strong liquidity, and the lost liquidity is compensated by interest.