I think you misunderstood his argument. Assuming I understand correctly he was saying that if you have $100 in your society and 100 goods available for purchas

I think you misunderstood his argument. Assuming I understand correctly he was saying that if you have $100 in your society and 100 goods available for purchase, evenly each good is $1, if you have $200 and 100 goods each good is $2. Despite doubling your money it is still worth the same. Obviously it is more complex than that but I think that's the basic idea he was getting at. You can only increase the wealth of a country if you increase the amount of goods rather than the amount of money as money will more or less scale to goods. From what I understood he was referring to goods as wealth.