Mostly man power and the power it takes to prepare the hot dog.

It's not losing money, it's losing a percentage of profit.

Say 10 hot dogs cost 1 dollarydoo.

1 hot dog sells for 1 dollarydoo that's a 10% food cost.

Enter bullshit inflation, hot dogs now cost 2 dollarydoos, so each one sold at 1 dollarydoo is now at 20% food cost.

that 10% comes out of profit margin unless your labor & fixed costs are 0.