Khan, Sal. (2013) “Keynesian Cross.” Khan Academy. https://www.khanacademy.org/economics-finance-domain/macroeconomics/income-and-expenditure-topic/macroeconomics-the-keynesian-cross/v/keynesian-cross

written as: E^p = C + I^p + G + NX

builds AD step by step and then analyzes how the economy moves towards equilibrium