A concentrated, collimated beam doesn’t act like a point source. There’s of course some amount of scattering and absorption loss due to atmospheric particles, but other than that a fully collimated wireless energy transmission doesn’t lose intensity over distance. Kind of obvious, really, because “where would the energy go?”.
It actually doesn’t really show much, except maybe that inflation exists and people generally have more money now.
If it’s supposed to show how the rich are getting richer and the poor are getting poorer, it does a lousy job. It’s practically impossible to see the relative change between the groups, since the lower two graphs’ behaviors are impossible to see. The only thing that can at least somewhat be seen is that the top 10% and the top 1% grow quite correspondingly.
So, basically that graph shows that everything seems to be as fair as it has always been. Probably wasn’t the intention, and certainly not a good representation of what’s happening. It’s very possible that the top 1% is included also in the top 10% and dominates it, but just based on that graph it’s impossible to know.
Quickly glancing through the paper it doesn’t really seem to support your claim. They attribute their major losses to the parabolic reflector (meaning they don’t have very well concentrated microwave beams?), and say that developing higher efficiency focusing components is important work for the future. I’m kind of guessing that’s one thing the Chinese are doing.
Still, I’m sure there are relevant losses even in properly focused microwave beams. How much that is, I have no clue, and didn’t see it addressed in the paper. Might have missed it - it was a very quick glance. :)