There's a great quote from a Terry Pratchett Discworld novel:
"The reason that the rich were so rich, Vimes reasoned, was because they managed to spend less money.
Take boots, for example. He earned thirty-eight dollars a month plus allowances. A really good pair of leather boots cost fifty dollars. But an affordable pair of boots, which were sort of OK for a season or two and then leaked like hell when the cardboard gave out, cost about ten dollars. Those were the kind of boots Vimes always bought, and wore until the soles were so thin that he could tell where he was in Ankh-Morpork on a foggy night by the feel of the cobbles.
But the thing was that good boots lasted for years and years. A man who could afford fifty dollars had a pair of boots that'd still be keeping his feet dry in ten years' time, while the poor man who could only afford cheap boots would have spent a hundred dollars on boots in the same time and would still have wet feet.
This was the Captain Samuel Vimes 'Boots' theory of socioeconomic unfairness."
I generally have the suspicion that "boots" and the like offer only micro-optimizations. Buying a $100-150 bag advertised for durability versus a $30-40 generic brand backpack. Or buying a MacBook Pro versus a midrange laptop with Windows.
While there may be optimizations to be found in these situations, I also wonder about the cognitive cost per optimization, and I wonder if it might not be better to put the most of your mind on a job or geography transition.
You're right -- if that were the issue, it would be a bad objection; let me try again.
The problem is that in real life, most such cases (of buying the more expensive item) don't result in a pure savings, but rather, leave you better off in some ways and worse off in others. The cheaper shoes, IOW, will not actually be so bad that you have to replace them entirely, and you will in fact end up with with more liquid savings. The temporary discomfort and greater savings are much harder to compare to the alternative than the example suggests, so wealthier people do not always have some obvious choice that leaves them better off in every way.
So, on top of that, it's not an issue that is fixable simply by pointing this out to the poorer person and loaning them the money.
A classic one in the US would be the choice of visiting the doctors. The rich can afford to have regular checkups(or insurance) and get a sniffle checked out early. The poor can not afford to visit the doctor over minor ailments and because of this end up spending big in lost time at work and more expensive one off treatments for a serious illness they didn't nip in the bud.
But I'd have to concede that you'd be right to say it still doesn't fit the boots analogy with out some rather lax semantics around up front vs long term cost. You could also argue that any individual might get lucky/unlucky and so it's not clear cut there, but I think it would be fair to argue that in aggregate the outcome on cost is a reasonable example.
My most recent purchase is a 900$ Bosch dishwasher that is saving me so much time (and time is money) and saving money indirectly because I am cooking more often at home as I don't find washing dishes to be taxing any more. Home cooked, all natural food is healthy in the long run. The sink is empty and it makes me feel less cluttered and more efficient. So it is a chain reaction and the effects are compounded. One thing leads to another. There is a 10000$ difference between a 500$ dishwasher and a 900$ dishwasher.
I have seen plenty of cases that are really that clear cut, usually centered around item quality. For example, cheap tools vs. expensive ones. The "X Factor" that makes the more expensive item not strictly better is the question of use. I.E., I don't buy Snapon wrenches because I am not a professional mechanic, but neither do I buy cheapo pot-metal tools because I use them enough that the extra money spent on quality is well worth it.
"The reason that the rich were so rich, Vimes reasoned, was because they managed to spend less money.
Take boots, for example. He earned thirty-eight dollars a month plus allowances. A really good pair of leather boots cost fifty dollars. But an affordable pair of boots, which were sort of OK for a season or two and then leaked like hell when the cardboard gave out, cost about ten dollars. Those were the kind of boots Vimes always bought, and wore until the soles were so thin that he could tell where he was in Ankh-Morpork on a foggy night by the feel of the cobbles.
But the thing was that good boots lasted for years and years. A man who could afford fifty dollars had a pair of boots that'd still be keeping his feet dry in ten years' time, while the poor man who could only afford cheap boots would have spent a hundred dollars on boots in the same time and would still have wet feet.
This was the Captain Samuel Vimes 'Boots' theory of socioeconomic unfairness."