[InclinedPlane]

This is a little silly. In the developed world food is remarkably cheap. Go into a grocery store and price a 5lb or 25lb bag of flour or rice, we're talking pennies per meal. It's incredibly inexpensive (less than a dollar a day) to feed oneself at a subsistence level, what is interesting is why so few people choose to do so, even when it would make economic sense.

[lurkerperpetual]

Sigh. It's not only and indeed not primarily about price. What about the effects on the environment of growing and transporting that rice? Also I sure would like to go on a hike in the mountains without needing to carry 25 Kg of food for a week. It is not silly, you are looking at it very conservatively.