I didn't downvote, but your premise is incorrect. You can have increasing economic growth with a dwindling population. Russia and Romania have experienced this

I didn't downvote, but your premise is incorrect. You can have increasing economic growth with a dwindling population. Russia and Romania have experienced this for over a decade. You may discount Russia as a post-Cold War bounce, but there are other examples of economies with negative or stagnant population growth that also experience economic growth. You claim that our economic malaise is primarily due to cultural problems, but you don't cite any data to support this. I doubt anyone collects statistics on the percent of people who "help others", but there are statistics that contradict your assertion that American culture is declining, e.g. the dramatic decrease in violent crime over the past two decades. You also ignore the possible causal relationship between a degrading culture (if it is indeed occurring) and national economic problems. Perhaps people would be less likely to help others if they feel less financially secure? Too much sex with too many partners and a declining stock of fertilizer, as causal factors of economic malaise, is a tenuous connection at best. If I had to guess, I'd say that most people didn't find enough relevant, substantial claims in your comment to bother replying to.