how to find profit function using cost and revenue (1) spiritual gain -- spiritual satisfaction; Marvin Loh, senior fixed income strategist at BNY Mellon, Turning interest into creating equality - bubbles are a sign of market demand and represent a majority of people's expectations of financial returns. We should see it as an opportunity for development. But if we stop, we may continue to centralize wealth, repeat the traditional power structure and miss out on real opportunities. It includes garbage trucks, refrigerated truck trucks, dump trucks carrying sand, concrete transporters, tankers, as well as trailers, semi-trailers, container trucks, etc. So why is yu 'e bao falling steadily?