Well, maybe not "lemonade stand" but yes, the connection to physical wealth quickly fails when you consider most economies. When you first learn about the reality of money - especially fiat currency - it can be disorienting because it's just not something that works at an individual level. Well, sometimes it does.

Real world example: a partner in an ad agency decided they want to exit the company. They want to get paid their share of the company value. How much is the company worth? Do you add up the value of all the desks, computers and light fixtures? Do you add in all the money in the bank? Do you add in outstanding invoices? No, none of these. You value the company at a multiple of earnings. So if the company earned 20 million dollars, the valuation is from 6 to 9 times that. Why? Because that's what you agree it's worth...so it's worth 120 to 180 million dollars. The executive takes their payout based the valuation they agree to, and thats it. The 100 million dollars of valuation over the 20 million in earnings don't exist - but they are real enough to force the company to cut a check or take on a debt obligation to the departing executive for, say, 5 million dollars, based on the severance settlement.