GOAL GRADIENT EFFECT

Summary from the TLDR Founders newsletter

The Goal Gradient Effect, discovered when rats ran faster as they approached food rewards, explains why we sprint to finish that fitness app streak, spend $45 more just to unlock free shipping, and complete coffee loyalty cards faster when given two "bonus" stamps upfront. Smart businesses leverage this psychology by visually displaying progress (like Ulta showing exactly how close you are to free shipping or Apple's closing fitness rings) to create an irresistible pull that transforms hesitant browsers into buyers who can't resist closing the gap to completion.