OK but why is the printing of new money causing a loss of value in a fiat currency and who determines and decides that the currency is now less valuable and that prices will go up?
If total assets in a nation is the same, but government and central bank print more money from the air, money printing manufacturers, you can see a simple situation, purchasing power of each $ must drop and locals must use more money to buy same item than what they spent before a wave of money printing.
Inflation and purchasing power has negative correlation, with assumption that other factors are the same. Think about Bitcoin, total supply is the same but demand on owning bitcoin will increase, price must rise with time and after some years, one decade, looking back we will see very parabolic growth.