why does the aggregate demand curve have a negative slope? (downward)
The aggregate demand curve, which illustrates the total amount of goods and services demanded in the economy at a given price level, slopes downward because of the wealth effect, the interest rate... The aggregate demand curve, which illustrates the total amount of goods and services demanded in the economy at a given price level, slopes downward because of the wealth effect, the interest rate... Star Gazing
The reasons for the downward slope of (micro) demand curve shouldn't be confused with the reasons of the downward slope of (macro) aggregate demand curve. The demand curve of an individual product slopes downward because of real income and substitution effects.