Demand curve is meaningless because humans don't have a stable and rational assessment of the price they would accept to pay for something (that's why having pretty hostess and expensive packaging are a thing) and this price also depends on many contextual factors: you're OK to pay much for for a glass of Coke in a fancy restaurant that you would accept at Mc Donalds, and a business values a piece of B2B software very differently depending on at which point we are in the fiscal year.

The so-called demand curve is as useful for a business as a population-wide heartbeat distribution would be. It makes no sense to talk about “the” curve, since it changes all the time!