2nd Place in Derby #320: Fall, with 215 votes!
Money disappears. Companies close or collapse. Styles fade. Stocks plunge. Homes deteriorate. Restaurants change management. Food rots. Cars break down. Clothing tears. People change. Nothing is stable enough to invest in.
Except maybe the seasons. The seasons come every year. One might be warmer or colder than the year before or the year after, but they keep coming back. They're the most stable thing to invest in outside of precious metals, and that stuff tarnishes anyway.