The phrase "supply decreased" is grammatically correct and usable in written English.
It is typically used to describe a decrease in the amount or availability of a certain resource or product. Example: Due to the unexpected increase in demand, the supply of face masks decreased significantly in the local pharmacies.
Enzyme supply decreased (P = 0.012) N absorbed by heifers.
As N supply decreased, leaf N content decreased curvilinearly (Fig. 1A).
Galiani et al. (2005) found that improving the quality of water through the privatization of water supply decreased child mortality in Argentina.
Choi et al. ( 2011) also confirmed that high oxygen supply decreased ethanol production by K. cryocrescens S26, but increased acetic and lactic acid products as well as encouraged excessive cell growth.
National data show that an average of 20% of the US population visits an ED each year (Owens et al. 2010) and the total number of visits to EDs increased 34% from 97 million in 1995 to 130 million in 2010 (a 16% increase from 37 visits per 100 population to 43 visit per 100 population) while ED supply decreased by 11% (NCHS, 2013).
As for individual ecosystem service, besides the food production, all of the ecosystem service values declined from 1980 to 2005, of which water regulation and supply decreased the most for the human-induced cultivation and the warming and drying trend in the Nenjiang River Basin.
When supply decreases - when there are fewer homes on the market - then prices will rise.
And as happens to all markets when supply decreases, prices have risen.
The problem of water is global: the world has just so much water and so much land; it's a closed system within which demand is increasing and supply decreasing.
An ecosystem service may increase even as its supply decreases if demand increases.
Market theory states that if total money supply decreases (or increases) then money supply in call market also decreases (or increases) because of restricted (or unrestricted) money flow to the financial institutions and banks.
