[pjmorris]

You have to factor in the time it takes to cook. Let's say you cook all the rice at once and it takes 20 minutes. At minimum wage of $7.25, that's $2.42 in addition to the 0.69 for the bag of rice, yielding 5.4 calories per penny, within the same order of magnitude as the prepared foods I gave as an example.

I acknowledge that a person's time isn't always tradable for wages, and that home cooking is generally cheaper and more satisfying.

[gozur88]

I don't find the time argument very compelling. It takes just a minute or two to boil water, you throw in the rice, and simmer for another twenty. Sure, it takes twenty two minutes, but twenty of those are just waiting. Normally I start the rice and then prepare the rest of the meal while it's simmering. Maybe 20-30 minutes for the whole meal.

Time-wise fast food isn't as efficient as it would seem at first glance. If you go during a normal meal time (which you pretty much have to do if you have kids), between travel time and waiting at the register, it's going to end up taking as long as a home cooked meal.