Answer:
a. Mortgage payments
Step-by-step explanation:
Fixed costs are costs that do not vary with output. e,g, rent, mortgage payments
If production is zero or if production is a million, Mortgage payments do not change - it remains the same no matter the level of output.
Hourly wage costs and payments for production inputs are variable costs
Variable costs are costs that vary with production
If a producer decides not to produce any output, there would be no need to hire labour and thus no need to pay hourly wages.