Ok I think I understand what you mean by demand vs quantity demanded, makes sense. Quantity demanded is directly affected by price, so if something gets cheaper, people want more of it. What I meant was demand, not that. From what I understand, if the demand goes up, for whatever reason, say the consumers suddenly have more purchasing power due to a tax break, surely that would make current producers invest more in their products or their production, and attract more producers in the market? I of course don't mean a linear correlation, but a strong incentive.

Taking money from the rich and giving it to the poor probably isn't economically optimal in many cases. Then again, intuitively I don't see how just buffing the supply side and ignoring demand would be either. Let's say friendly aliens come to earth and either a) give a gram of gold to 1000 poor people or b) give a kilo of gold to one rich guy, the economy at the bare minimum would not be worse off in scenario a), and quite likely would be better off, would you agree?