Sure, you’re talking about the wet bulb temperature.

But.

You’ll find a lot of people from the northern part of the US that simply can’t function in the south in the summer, when it’s >90F. I’m a transplant from the north to the south; I’ve adapted just fine, by virtue (?!) of not having air conditioning. And it goes the other way too; if you move to a colder climate from a hotter one, you’ll eventually adapt to it.

This is not the case for all people, but most people will be able to adapt.

I don’t know if this is possible on Amazon

It’s certainly possible to get e-books for free, with only a very small amount of piracy.

That’s one of the major issues that I have with corporations; there’s very little interest in sustainable profitability, and a laser-like focus on growth for the sake of growth. And sometimes the product that a company makes isn’t even “sustainable” per se. That is, if you make certain durable goods, eventually you should be reaching a point where demand will slow to a trickle as the market becomes saturated, and that’s okay.

IMO, it might be a good idea to compare those prices against relative purchasing power of a dollar. I don’t know how those prices stack up to the overall rate of inflation or CPI, or even the cost of the specific ingredients. I would have less of an issue with price increases if a) McDonald’s profit margin–as a percentage of cost–remained steady, and b) the cost held steady against the relative value of the dollar overall. If it’s just arbitrarily raising prices because they can, then that’s bullshit.