Spending money, if you stop and think about it, only transfers that money to someone else. The money is still there, its quantity hasn’t changed, but it’s just in a different person’s bank account or wallet now. That’s fundamentally why money can’t “flow into” an asset. If you buy an asset, that money you spent is still available to spend, just by someone else rather than by you. It’s not somehow sitting there inside the stock or bond or real estate, waiting for you to sell your asset so it can emerge back into the financial landscape and be spent again.