Because starting a business might still lead to higher returns for you than hoping that your money will be worth more.
One thing i’ve always wondered: If something like Bitcoin was the only currency, then it would be like a direct mapping of 21 Million Bitcoin <-> all global economic activity and goods and services. In that case, shouldn’t its price be relatively stable, and might actually even go down sometimes? Like in big natural disasters increasing the cost of certain goods?
I’m not a crypto zealot, but I’m not a big believer in the idea that the economy needs to be stimulated and I need to be forced to spend my money before it loses its value. I just want to buy what I need or really want.
And in the hypothetical case of having a mapping of “all economic activity” <-> “21M payment units”, then the relative stability of this money might still make investments more lucrative than just hoping for my money to be worth slightly more tomorrow. In this hypothetical scenario it would be more like “my money is worth 1000 eggs today, next month it might be 1001 (if others grow the economy) or 999 (if something unforeseen happens halfway across the globe). So if an investment looks like it might yield the value of 1100 eggs there would still be people to take the risk of investing, no?