This podcast episode explores the importance of metrics in Amazon advertising, specifically focusing on ACOS (Advertising Cost of Sales) and ad cost of total sales. The hosts argue that these metrics are crucial for optimizing campaigns and ensuring profitability. They discuss the correlation between ACOS targets and ad cost of total sales when launching a new product, as well as the relationship between organic sales, ad cost of total sales, and the target ACOS. The podcast also emphasizes the importance of historical data, experimenting with ad spend, and analyzing correlations between ad data and total sales. Additionally, it delves into the complexities of analyzing ad cost and sales attribution, highlighting the significance of accurate attribution and understanding metrics.