Is there a 4th level? The 3rd is supposed to be the top - knowledge based economy focused on providing services rather than resources or manufacturing. That's w

Is there a 4th level? The 3rd is supposed to be the top - knowledge based economy focused on providing services rather than resources or manufacturing. That's why it seems once you're in a 3rd level economy, there's not other massive jump. It's all efficiency gains or shifting to other problem areas. Then you add in the other economies that are moving up to 3rd level and it seems there's an oversupply at that level where not locally confined such as a plumber.