👉 Bath math, also known as the law of bathtub curves, is a graphical representation that illustrates the cost structure of a manufacturing process over time, typically focusing on the total cost of production. It's divided into three distinct phases: the initial high costs due to setup and startup (the "rising" or "bathtub" shape), where costs increase rapidly but then plateau as the process becomes more efficient; and the eventual decrease in marginal costs as the production process reaches a steady state, where additional units become cheaper to produce. This model helps businesses understand and optimize their production processes by identifying areas for cost reduction and efficiency improvements, ultimately aiming to minimize total costs while maintaining desired output levels.