It very much depends on the people and the relationship. Through many years, I've swung a few hundred$+ in either direction with a bunch of people, thousands with a couple.
I much prefer zero stress - if money is tight, we just don't do expensive stuff, or steal the bill before they have a chance to pay. Mostly that means we stay cheap until we can safely cover multiple people if needed (running your safety-buffer low enough that you can't do that is a terrible idea anyway).
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It very much depends on the people and the relationship. Through many years, I've swung a few hundred$+ in either direction with a bunch of people, thousands with a couple.
I much prefer zero stress - if money is tight, we just don't do expensive stuff, or steal the bill before they have a chance to pay. Mostly that means we stay cheap until we can safely cover multiple people if needed (running your safety-buffer low enough that you can't do that is a terrible idea anyway).
The economic term is "price gauging".
OP increased the cost of forex from 0-5% to 15% when his "friend" was desperate.