In economic discourse, we often hear the simplified maxim that demand drives supply. While this intuitive principle captures many market dynamics, classical economics has long recognized the inverse relationship as well. Jean-Baptiste Say, the influential 19th-century economist, articulated what became known as Say's Law: "Supply creates its own demand." Though sometimes overlooked in popular economic discussions, this principle remains an important part of classical economic canon. This bidirectional relationship between supply and demand becomes particularly relevant when examining how delivery networks could transform local economies. The prescience of Say's insight becomes apparent when we consider how an independent, organized delivery network could stimulate entirely new economic activities at the local level—creating demand through the very availability of its supply. From Two-Sided to Four-Sided: The Evolution of Digital Marketplaces To understand the potenti...