Simplify this problem:

1. Before, because Boss Wang had no change, he traded the young man's fake 100 for the neighbor's real 100. But later, the neighbor found out that the money was fake and changed it with boss Wang. The neighbor didn't lose a penny. Everyone can understand this. In fact, this is a smoke bomb, and everyone ignores the neighbor, indicating that Boss Wang and the young man have been making a deal.

Let's see what young people get from Boss Wang for nothing. Why did you say it was free? What should be given to young people is a fake hundred, which can't be circulated, just like a blank sheet of paper. There is no difference between giving and not giving. ) Young people got cash 79 yuan and a commodity worth 18 yuan for nothing.

Then in this transaction, the direct loss of boss Wang is the free income of young people.

Namely: Boss Wang lost 79+ 18=97 yuan.

However, in business, this kind of transaction is successful. If the young man's 100 yuan is true, Boss Wang should be able to earn 3 yuan in this transaction (the price is 2 1 yuan-the gift is 18 yuan, and the cost is 3 yuan).

That is, Mr. Wang's loss is 79+ 18=97 yuan+due profit 3 yuan = 100 yuan.

So, mathematically, it's 97 yuan.

But from an economic point of view, it is 100 yuan.

However, most bosses are black-hearted, and a fake hundred will definitely cost money. If it succeeds, there is no loss! ! Hehe, personal opinion. Let's make more comments.