What does "drought is the source of ships and water is the source of cars" mean? What is the philosophical meaning?

Buy a boat in a dry year, sell a boat to buy a car in a wet year, and sell a car in a dry year.

China was an era as early as the Spring and Autumn Period. Fan Li, the originator of business, has a famous saying about business, which is still a classic in today's marketing. "Water is a car, and drought is a boat", and "water" means that when there is a flood, it is necessary to start preparing a car for dry weather (JIU); "Drought" is the dry season, so when others are busy building cars, we begin to prepare boats and use them when there is water, which shows that we should be forward-looking. He put forward the management principle of "as cheap as pearls and jade, as expensive as dirt". He believes that "cheap things are expensive and expensive things are cheap", which has always been verified in today's stock and Chinese herbal medicine management.