012路必有1路方法

简介：A salt merchant pays three or four taels of silver and 430 kilograms of salt. After the merchant pays the tax, he can buy salt and sell it. But the strange thing is that even though there is no shortage of salt banknotes, the amount of salt is increased year by year. It has decreased from more than one million during the time of Emperor Shenzong to less than half a million now. What is happening?