Is the material world money? You sell something to get it. You can sell your time, you can sell your energy, you can sell another part of the material world. If you sell something material, what happens? Money sells money in the stock market. So you just sell money to get money. Does whatever you sell turn into material existence? It does.
When a lesser amount of money buys a higher amount of money, the lesser amount of money gets more valuable (deflation).
The buyer keeps the money they bought the higher amount of money with (money is created).