The amount of time required to prepare incrementally larger batches increases at a sub-linear rate. The bigger your batch, the more food you get per unit of wall clock time. I try to prepare no less than 3 lbs of dry beans or 2 lbs of beef at a time. Anything less does actually feel like I'm wasting my energy.
The thing I see stopping most people in poverty is lack of access to a kitchen. No oven, no stove, no pantry, etc... A hot plate and a microwave if they are lucky. Also the usual health issues that come from deep poverty like executive dysfunction, depression, and other chronic illnesses.
Why should this be the case in principle though? Do economies of scale not apply to food preparation?
The homeowner does not charge themselves rent for their own kitchen, nor for their time.
Does it make economic sense? Yes, when you know that there is a frozen potato cartel: https://www.potatopro.com/news/2024/alleged-potato-cartel-ac...
I was far more likely to cook from scratch when I was poor than when I was not. And honestly, the food was healthier too. Basic life skills.
It takes very little time to prepare and cook most simple meals - if you want to dress it and garnish it and execute a 1000 step recipe, that is of course on you. For example, you can have a steak and potato (loaded with cheese and sour cream) as good as anything you get in a restaurant in under ten minutes. It is rarely faster to go out to eat. That is of course taking as a given that people really are working more hours, which I am very skeptical of and which BLS data does not support.
I am sympathetic to people's arguments about cost and free time generally, but I think "cooking your own food" is mostly a victim of the increasingly sky-high value people place on convenience vs doing almost anything for themselves that constitutes "work" in their minds. It is definitely not true that money is the issue, as other commenters already mentioned.
Not true on average. The average American spends 4-5 hours a day on personal screen time.
And those who complain about not having time to cook I'd bet dollars to donuts are pulling that average up, if my personal lived experience is anything to go by.
There is a case here in terms of two income households being the norm these days, but that's really about it. The average person today lives a life of far more comfort and convenience than even in the 90's.