I usually go with the light switch/outlet screw but you said those are covered. There must be grounded metal somewhere in your house. The microwave body, a pipe or faucet, you could even get one of those grounding wrist straps that plug into the ground port on your wall socket.
It does match exactly what's happening though. Others have mentioned housing cost which is a clear example, but you can also look at income inequality. Here's an article which cites data from the congressional budget office https://inequality.org/facts/income-inequality/
It shows up to 500% growth since 1979 in the earnings of the .01% while the 99% of earners are only making about 50% more than in 1979. That data makes it clear that wealth is being concentrated, and that people at the bottom are going with less. Especially considering inflation since 1979 has been 320% (source)
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local_taxi_fix
joined 2 years ago
If it's attached to the wall theres probably bare metal on the bottom, and if not there's definitely some on the inside when you open the door. Just any bare metal on it.