how to fund a non profit The determination of this ratio mainly depends on the supply and demand relationship between the two sides and the competition. In general, the interest rate falls when the supply exceeds demand. Interest rates rise when demand exceeds supply. In addition, law, habit and so on also have a larger role. Marx's theory is of guiding significance to explain the question of interest rate decision under socialized production. Charlotte Nelson, of Moneyfacts, said: "only 56 providers of SVR went up, seven of which raised their interest rates by less than 0.25 percentage points, resulting in a more modest rise in average SVR. The standard variable interest rate (SVR) is usually adjusted at the base rate, and these standard variable interest rates (SVR) are not fixed or floating transactions. Positive economic profit is sometimes described as excess profit.