To understand this, we must first understand what human society is and why there is human society.
Human feelings are actually a way of trading.
Many people think that after the industrial revolution or modern market economy, there will be division of labor and transactions.
In fact, since the birth of mankind-even not only humans, chimpanzees and vampire bats have traded.
Vampire bats feed on the blood of cattle and horses, but there are always bats that can't find food for the time being. At this time, they will get ruminant blood from close companions. The next time his companion needs it, he will give it back first.
In the primitive hunting period, it was very uncertain to catch a prey.
Maybe this week, A caught its prey, but next week, B caught its prey. If A beats a lot of meat, the whole family can't finish it, and it is easy to go bad, so I might as well give it to B as a personal favor. Wait until the next reversal, and then get a return from B.
-this is the most primitive transaction.
Is it a bit like futures?
Primitive people who were full for two days and hungry for two days were able to eat in four days through trading. It is equivalent to doubling wealth.
However, there are risks in this transaction:
B has no conscience and will not return to A.
In the primitive society without laws and contracts, we can only endorse with human feelings, repeatedly emphasize reciprocity and condemn ingratitude. This ensures that the giver can be rewarded.
In this "primitive market", human feelings act as a "universal equivalent", which makes the transaction successful.
Everyone can feel that owing a favor is like owing a debt, and owing a favor means paying it back.
Therefore, human beings have evolved the psychological function of remembering traitors and owing others a sense of guilt.
This is the origin of human society.
Financing can be achieved by paying off debts.