We can make a statement. Forces of competition in the economic development distillates future prices such that they are lower than present prices. In other words, the competition in economy precurses the negative time preference. Negative time preference causes the disappearance of interest as economic category. It is the economy where the purchasing power of money would continue to increase in the history of economic development.
Competition therefore increases the purchasing power of money.
In this logicality competition causes the disappearance of interest as economic category. This existence of negative time preference will not automatically promote interest-free economy. Those who have saved money will not easily lend money to anybody. The risk factor is real. Unless risk factor disappears, interest-free economy can not become a reality.