Demand functions differ across household depending on observable and unobservable characteristics of the household
Demand functions differ from household to household.
Demand functions do not differ across household.
A man works with a puppet and a musical instrument.
The airport here was built only a few years ago.
A woman sits next to a car.
I can recall it, but I am less than fantastic.
The boy is ready to take a swing at a ball using a bat.
People are playing music.