The phrase "affecting the amount of" is correct and usable in written English.
It can be used when discussing factors that influence or change a specific quantity or level of something.
Example: "The new policy is affecting the amount of resources allocated to each department."
Alternatives: "influencing the quantity of" or "modifying the level of".
Other phenomena affecting the amount of money that people willingly hold include income, wealth, and some measure of transactions volume.
Lead lines are one of the most serious risk factors affecting the amount of lead in water that pours from the tap.
The plan is not without risks: if the government sells its shares too quickly, A.I.G.'s market value could be driven down, affecting the amount of money that will be returned to taxpayers.
By measuring ice over a three-year period, CryoSat will enable scientists to determine the rate at which climate change is affecting the amount of land and sea ice.
With regards to child maintenance, One Parent Families/Gingerbread, the charity for lone parents, had been hoping for a full disregard for child maintenance in means tested benefits, which would have meant families could get their full child maintenance without it affecting the amount of family benefits they receive.
By March 3rd, the Iraqis had managed to repair the stations; had they failed to do so, they would have had to embark on an arduous application process for spare parts that takes months.The dilemma for America and Britain is that damage caused by bombing is likely to affect Iraq's oil exports, thereby affecting the amount of food and medicine that can be bought with the proceeds.
Breastfeeding did not affect the amount of sex couples had.
Stopping the mine, they argued, would not affect the amount of greenhouse gases in the atmosphere.
If a student has a maintenance grant it affects the amount of maintenance loan they can borrow.
Any money released from these schemes may also affect the amount of means-tested benefits to which people are entitled.
Certainly they do affect the amount of radiation coming from the sun.
