Forget the currency aspect, which is nothing but a distraction. What matters is the balance between production and consumption. Without debt one must first produce goods before one can consume. Individuals can get around this by taking out loans, borrowing the opportunity for consumption in the present from someone else with a positive balance. For society as a whole, however, there is no avoiding it: goods which have not yet been produced by someone are not available to be consumed. Introducing new currency in order to fund consumption disrupts the balance, since there is no production to offset the consumption. The result is that society becomes poorer; capital is consumed without replacement, productivity falls, and goods become less affordable. (By this I refer not not only to rising prices, but to prices rising faster than wages, a increase in the cost of goods even after adjusting for the change in money supply.)

> Inflation is not a function of the money stock, it happens when sellers collectively mark up their price above current market rate.

The term "inflation" has multiple definitions. Yours is popular in political circles but is not very useful as an economic indicator because it conflates ordinary changes in prices due to supply and demand of goods and available production capacity with changes due to shifts in the money supply. The general increase in prices which results from consumption of capital is nothing like the change in prices which accompanies a deliberate increase in the supply of money. The former is a useful economic indicator which suggests a need for more saving and prudent investment, while the latter offers nothing but noise and tends to encourage malinvestment and waste.