Why don't I recommend joining at will?
This paper introduces a commonly used concept in the laboratory-univariate method, which verifies the function of the univariate by controlling the univariate and excluding the interference of other factors.
Doing experiments is still the same. Doing business is so complicated, how can you forget this basic rule? It is not that doing business is more difficult than doing experiments, but that doing business is actually a struggle with human nature, and I don't need to say more about the complexity of human nature.
Seeing that the business of the other store was good, I wanted to join, so I paid the joining fee and opened a new store.