The curve representing this quantity is always downward sloping due to Pigou's wealth effect, Keynes' interest-rate effect, and the Mundell-Fleming exchange-rate effect.  
The curve representing this quantity is always downward sloping due to Pigou's wealth effect, Keynes' interest-rate effect, and the Mundell-Fleming exchange-rate effect.  In the Mundell-Fleming model, it can be stated by an equation that relates consumption as a function of disposable income and investment as a function of interest rates, net exports, and the GDP, all of which, when added together, equal the total income or output. FTP, what is this economics concept that represents the total demand for goods and services in an economy?
The curve representing this quantity is always downward sloping due to Pigou's wealth effect, Keynes' interest-rate effect, and the Mundell-Fleming exchange-rate effect.  
aggregate demand