Whoa.
I mean, the core assumption that even small villages can provide characters access to the gear they need to pursue their adventures works for me. I don't ever see myself delving into the economics of food scarcity to the extent outlined.
I think hirelings, mounts and vehicles are all useful, but, assuming the standard set of scores, the average carrying capacity of a character is 180 pounds, which is not insignificant. The real issue is carried container capacity. A backpack can only hold 30 pounds of gear inside, which isn't a lot considering 10 days worth of rations is 20 pounds.
Everything boils down to what's reasonable, like carrying only 1 waterskin, which is the equivalent of walking around with a half gallon of milk bouncing off your hip. If you'd like to carry more water, you need a mount or vehicle to do so. Same thing goes for torches, which weigh 1 pound each. Carrying 10 of them is quite the bundle, so there's your limit.