The phrase "affect the availability" is correct and usable in written English.
It can be used when discussing how certain factors or conditions influence the accessibility or presence of something.
Example: "The recent weather conditions may affect the availability of fresh produce at the market."
Alternatives: "influence the accessibility" or "impact the presence".
"A negative Nice appraisal on trastuzumab emtansine will not affect the availability of this drug via the Cancer Drugs Fund".
Mortgage lenders are now hurriedly working out how the guarantee scheme will affect the availability and pricing of home loans.
Are there other factors that might affect the availability of financial aid in future years?
Congressional investigators examined the military's growing reliance on foreign communication satellites and warned that technical and political upheaval "could affect the availability".
We're waiting to see the fixture schedule, because that could affect the availability of our second overseas player for the Twenty20 competition.
It will also allow researchers to track whether laws on same-sex marriage affect the availability of domestic partner benefits.
These "open access" auction rules have already received considerable attention, but the commission also faces other decisions that will significantly affect the availability and the price of wireless service.
Raising the fare could also affect the availability of cabs -- as well as the environmental impact -- because more drivers could be drawn into the business, allowing fleet owners to put more cabs on the road for double shifts.
Because cassava chips have been commonly used as animal feed, new demand from the biofuels industry might affect the availability and cost of meat.
Surface waters are expected to form more stable layers as the oceans warm, which will affect the availability of nutrients and, it is increasingly feared, of oxygen.
He strongly urged the government not to give Plan B One-Step's maker, Teva Pharmaceuticals, market exclusivity, which could affect the availability and cost of generic versions.
