Lol wut? Julian Simon was a clinically-depressed psychologist who liked to publicly engage in a rather sociopathic form of self-delusion -- convincing himself that everything really was getting better all the time and that unrestrained capitalism wasn't what everyone could plainly see, a flaming, pesticide-infused shit sandwich.
This was America's response to the 70's oil shocks and the environmental movement -- Ronald Ray-gun consulting astrologers as to how many trillions of dollars worth of debt to saddle future generations with in order to build space weapons to fight communist nazis, and economists declaring that debt and environmental degradation isn't a problem because everything is infinite if only you believe
"I have created a new economic system. It's called trickle-down economics!"
Simon didn't figure out anything. He just correctly realized that a billion Chinese could be easily deluded by their government into signing up for work camps and that Americans would tolerate exchanging steak for salt-and-tallow-infused pre-formed hamburger patties... at least for a while. That arrangement won't last another five years. You think commodity prices are high now? Just wait until average Asian workers get tired of building disposable crap they can't even afford and average Westerners get really fed up with eating $12 hot dogs at every meal. A few students rioting in Europe over tuition prices will be a cake-walk compared to that.
"Re-sources" are infinite, because they are cynically defined so as to include human labor. Of course you can easily make anything "infinite" if you just include the infinite labor of infinite future generations in the equation. And inter-generational debt-slavery can go on pretty much forever, or at least until the last human born into a desert wasteland lacks the physical ability to manually desalinate the last drop of water and has failed to evolve a chlorophyll-powered reverse-osmosis organ.
of wealth, on the other hand, are finite. A psychologist-turned-business-administration-professor may try to convince you otherwise, but anyone with the most basic education in physics or chemistry can see it's true.
Let's just agree that sandwiches are an unlimited resource too, as long as I can come to your house and beat you with a rubber hose every time I want you to make me one.