It is, the monetary value is based on what you can purchase with it, things. It is also how the measure of inflation is taken, what you can purchase with the amount of money you have. If it is "gold" currency, that same system is used to value the money and to count inflation.Economic growth should be tied to specific resources. Just like life. Abstracting it is what makes people dependant upon lies and violence.
I'm wondering why you don't advocate returning to the barter system, you exchange something of value for something of value.