I don’t agree. The economy grows when money changes hands faster. The money supply does not have to grow. This is clear when you see how we are paid hourly or on salary, either way, it’s a measure of money over time.
The gold ensures that the money supply is not diluted. This becomes a problem when you or I make $XXXX per year or hour. When our servant government decides to print more money, as it enters circulation, it dilutes the value of our money, but we don’t get a raise, thus our same dollars are now worth less.
The Gold standard serves to ensure that the value of currency cannot be diluted.