But the economy is not zero sum, like that bag. If I have a process that increases the total number of skittles in the bag, is it still unfair for me to take more skittles from it?
Tax the wealthy and use that money to invest in infrastructure, education, and economic growth across the entire country, not just the big cities. Combine that with limiting trade with countries that have abysmal minimum wages and standard of living, and you'd have a fantastic recipe for economic growth for the lower and middle classes.
Luck is always involved, but by increasing opportunities while giving workers more leverage, it is definitely doable.
If you end up with a mountain of skittles that you can use to crush anyone who irritates you while everyone else is eating all the skittles they get in order to survive, then yes, that might be a problem.
But does this actually describe the current state of affairs? If not, how would we get there? That seems like a cognitive jump from people taking unequal amounts of skittles.
So, you're right - the economy is not zero sum, but the resources are. The economy is about moving them here or there.
It depends on where you got those skittles? If you are increasing the skittle count by just taking from other peoples' bags of skittles then you're literally the mortgage/banking industry and there are probably lots of empty skittle bags out there propping up our never-ending-skittle-bag.
Is it a problem for me to do what you say if the skittles themselves become effectively cheaper for everyone else to enjoy? What if systemic issues only happen every 10 years? Or 5 years?