The area under the saturation curve

[XLaska-tech]

Hi all! Attached is the graph with the saturation curves by channel.

1. Are the highlighted points the saturation points, meaning that any additional spend beyond that spend yields little to no return?
2. It is stated in the Robyn documentation that “The end of grey area projected on the Y-axis is the carryover effect, while the dot (average spend) projected on Y is the total effect. “
   • In my graph, the dot projected on Y for the red line is ~$133K, so based on the explanation above, the total effect is ~$133K. That seems impossible because the total effect in revenue generated from that channel is ~$9M (based on the Response Decomposition Waterfall by Predictor graph). So, isn’t the total effect actually calculated as the area under the response curve (the red line) between ~$1K and $56.8K on the x-axis?
   • Same logic with the carryover effect - isn’t it calculated as the area under the response curve between ~$1K and $56.8K on the x-axis (where the arrow is pointing to)?