"increase in the quantity" is a grammatically correct and usable phrase in written English.
It refers to an upward change or growth in the amount or volume of something. Example: There has been a significant increase in the quantity of plastic waste produced globally over the past decade.
There has been a significant increase in the quantity of content offered online.
One consequence of this was a great increase in the quantity of education provided.
I have ordered, on occasion after occasion, an increase in the quantity and quality of weapons made available to the South Vietnamese.
It follows that inflation a sustained increase in the rate of price change cannot occur without a more rapid increase in the quantity of money than in output.
Alongside a cut in the price of money, the MPC also announced an increase in the quantity of money via a new programme of asset purchases covering £60bn of government bonds and £10bn of corporate bonds.
The rise of extended writing in the primary classroom is nothing new – most schools will have seen a notable increase in the quantity of writing, editing and re-writing their pupils are required to produce.
It reported: "Feedback from retailers suggests that the warmer than average weather resulted in an increase in the quantity bought as consumers brought forward the purchase of summer clothes".
John Maynard Keynes thought so: "A large increase in the quantity of money may cause so much uncertainty about the future that liquidity-preferences due to the precautionary-motive may be strengthened".
Polycythemia (erythrocytosis) is a condition characterized by an increase above normal in the number of red cells in the circulating blood, usually accompanied by an increase in the quantity of hemoglobin and in the volume of packed red cells.
An increase in Q means that P will remain relatively constant, while an increase in P will occur if there is no corresponding increase in the quantity of goods and services produced.
There was a considerable increase in the quantity and sophistication of historical work on Persia and Sparta, and war studies regained its status as a respectable branch of sociocultural history.
