Do you believe the economy and the hot 100 have a close relationship?

I really do think so. I studied how the rate of immigration and the rise of urban music (2000's-2007) were closely connected. The U.S. economy boomed during 2000's because of the housing bubble thus leading to a migration of immigrants (mostly from mexico) feeding the hot 100 with spanish/urban music (shakira,enrique iglesia, etc.etc.) but once the housing bubble burst in 2007 urban music seemed to burst as well eclipsing it with pop music. Once the recession came through immigrants started to leave the u.s. giving more listening power to other genre's.

This is just the tip of ice berg one of many examples how economics and music collide. I will be studying more on the relationship on these 2 with charts and graphs.

When the economy crashes, dance music increases in popularity. It's happened each decade like that for the past 80 years or so. People want to feel happy in times of hardship, so they listen to music that's uplifting, aka dance/dance-pop. When economic times are sound, people like to immerse themselves in their wealth, aka the glam/gansta rap of the early/mid 00s. Coming out of the economic recession, people celebrate minimalism and shun materialistic culture, thus songs like Royals and more simple, mid-tempo songs celebrating topics excluding wealth and fame.

So yes, in a way

your theory is
royals was a song that came from an individual artist, you act like the gp created it

Well they're the ones who enjoyed it and bought it, soooo. But ok.