I'm speaking in broad terms, not individualist terms. More wealth from a macro perspective = more consumption.
I'm a frugal saver also. I live well below my means and tend to consume less in day to day purchases. However, I've saved up quite a lot in a short time, and eventually I'm going to spend that money. This will likely be a bigger property and nicer house. That is consumption. Who knows, I always joke about how I'm going to buy a helicopter. If traffic makes me angry enough, I might get serious about my threats.
So it's possible that individuals have wealth but don't consume more physical resources, but it's unlikely, and not the norm.
Even if a wealthy person invests the money, that investment will be used to spur growth, which is consumption. The link between wealth and consumption is direct.
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