I particularly like this section so I'm commenting on it.The problem is that it's a bunch of disparate markets, not a unified global one. People are much more likely to spend money close to home, and unless you're exporting your goods close to their home, if you buy THEIR product, then revenue is sunk into THEIR local economy. Which is why the US is having so many economic problems right now, the USA offloaded basically all production/manufacturing jobs to China (and a few other places, but mostly China). Which means that all the money is flowing to China, which means there's less money coming into the USA, which means US citizens have less money to spend, which quickly leads to less spending. That's why buying local is so advertized. That's why the advice during recessions/depressions is to spend. Because the only way to have a healthy economy is to have money flowing, and if the money leaves the system, the system dies. Right now with the way corporations are pushing for prices at the cost of sustainability? The money is BLEEDING out of the US into other countries. Which is unsustainable. Which is the point of all the advice to buy local. Because if more people did that, your job would almost certainly get more money, which means you would have better job security and likely get more money to spend; the only people that lose out when you try to buy local when reasonable are the other markets that almost certainly won't be sending money back your way.
The scenario is analogous to a wolf population which is primarily sustained by the rabbits it catches. The two populations wax and wane. If the wolves get too good at hunting, the hares drop off. The wolves then starve. So the hares rebound.
The "sustainable" response here isn't to interfere and try to balance out one population or the other. The response is to let it proceed. Right now our western countries are at the shitty part of the cycle.
Countries like the US and Canada (my own) are going to suffer at a rate inversely proportional to how well we adapt. That or we prop up our economies with artificial market pressures. The little people like me aren't going to notice a big difference either way but I put a bit more pressure on my local economy to adapt faster when I make a point of buying "intelligent" instead of local.