Microeconomic theory describes supply and demand in a free market as two functions that are related only through the price: the produces decide how much to supply given the price, and the consumers decide how much to buy given the price.
But sometimes, the supply directly influences the demand. For example, if the supply of bus-trips decreases (say, from once in 5 minuts to once in an hour), then more commuters will buy a car, since they cannot rely on bus-trips. These commuters will not use bus at all. As a result, the demand for bus-trips will decrease. This effect is unrelated to the price of bus-trips.
Is there a term for such a direct influence of supply on demand?