The value of money is affected by the price level. When the price level in an economy increases, the purchasing power of money decreases, and vice versa. This is because when prices increase, each unit of currency can buy fewer goods and services, reducing the value of money. On the other hand, when prices decrease, the purchasing power of money increases, making each unit of currency able to buy more goods and services. Therefore, the price level is a key factor in determining the value of money.