Robert Frank, writing for the Wall Street Journal (9-30-10), speculates on whether the wealthy or non-wealthy work harder. An excerpt from the story:

"British billionaire Richard Branson is quoted today as saying that the wealthy don't work harder than everyone else - they are just fortunate. "Yes, entreprenuers may work hard, but I don't think they actually work any harder than, say, doctors, nurses or other people in society, and yet tremendous wealth comes with it and therefore enormous responsibility comes with that wealth, responsibility to do good things, maybe create new businesses and maybe tackle some of the more seemingly intractable problems in the world.."

He may be right. But studies on the comparative work habits of the wealthy tell a different story. Research by professors Mark Aguiar and Erik Hurst combined the results of several large surveys (including studies where randomly chosen subjects kept detailed time diaries), and found that the working time for upper-income professionals has increased compared with 1965, while total annual working time for low-skill, low-income workers has decreased."

Question: based solely on the above, can you explain which individual - the wealthy person or the low-skilled worker - has a higher reservation wage?