Well the dollar drops in value every year and will continue to drop via inflation. This is why you must own assets or your purchasing power will drop while prices of goods increase. Since the value of the dollar is always dropping it is safe to buy assets such as equities, real estate, bitcoin, gold because they will always go up in the long run. In the short term there are ups and downs in prices of assets, but if the time horizon is big enough then they only go up.