From the episode description:
Demand and Supply – the cornerstone of economics! But how much do you know about Alfred Marshall, the first man to draw the ‘Marshallian Cross’ that we all use today? Some argue his ‘Principles of Economics’ was the most influential book of the 19th Century and set the template for every economics textbook that followed. This episode is jam-packed with economics and guiding you through as always are Pete and Gav, your friendly neighbourhood economists.