The phrase "affect the supply of" is correct and usable in written English.
You can use it when discussing how certain factors or changes influence the availability of goods or services in a market.
Example: "Changes in consumer demand can significantly affect the supply of essential goods."
Alternatives: "influence the availability of" or "impact the supply of".
Price increases and the import crisis have also begun to affect the supply of medicines into tEgypt.
The spokesman said the move did not affect the supply of meatballs to Ikea restaurants in the UK.
News reports on state television said Wednesday's blast will affect the supply of gas to households and local factories near El Arish.
To the outside world, especially countries in Asia struggling to cope with heroin and methamphetamine addictions, a critical question is how a conflict would affect the supply of illicit drugs.
But, if we can't affect the supply of oil, we can affect the demand for it — and the best way of doing that is not to cut gas taxes but to raise them.
This consolidation of resources has already begun to affect the supply of medium-budget movies with serious themes and respected actors in the leading roles, the kind of pictures that have dominated most of the Oscar races this past decade.
Gordon Grant, a director at the site, told BBC Scotland the strike could stop the flow of oil from the Forties pipeline system, and affect the supplies of fuel into Scotland.
Changes in temperature, he said, could be one of several factors affecting the supply of the fungus.
NATO's bombing of five power-transmission plants has seriously affected the supply of utilities.
That jump in price illustrates how the disaster in Japan has immediately affected the supply of all sorts of components used in myriad consumer electronics and other products.
I enjoyed the details of his investigations of factors affecting the supply of housing and other structures that may help to explain their rapid increase in value in major cities.
