https://mjperry.blogspot.nl/2010/07/as-share-of-income-ameri...
However, it still sounds bizarre that about 90% of their expenses was food.
http://www.hindustantimes.com/interactives/how-do-people-in-...
It may appear for those in state housing that food is their greatest outlay but that would only be if accommodation provided by welfare wasn't classed as "income".
In Twain's position, and time, would food have certainly been the greatest outlay?
For two adults and five children? If you're working class, it'll cost a good chunk even today (barring state subsidies).
What do you think being poor is?
Basically what they say is that yearly spend was $960, and then present it as per-month-cost, but I can imagine food prices varied quite a bit with the seasons back then, so that true spend at any given month could be quite a bit different from this average.
An avocado in a British supermarket costs about 90p right now. In season, you can normally get at least three of them for that money. Similar price changes occur for soft fruit etc.
100 years ago (even 50 years ago), your diet, rather than your food budget, would have been the thing that changed with the seasons to match availability.
$485 - mens suit
$8000 - NYC rent
$150/day - working person salary
$600 - rural rent
$35/lb butter
$40/dozen eggs
You need to buy your butter and eggs elsewhere if you think these are reasonable comparisons to today's prices.
I know back in the late 70s/early 80s my grandmother talked about buying a sack of flour, bags of beans, tubs of butter, and similar staple foods for pennies each, and that would have been the 1930s.