The Internet Association has released An Empirical Investigation of the Impacts of Net Neutrality.
Here's an excerpt:
The empirical evidence shows that the implementation of NN rules has had none of the negative impacts theorized by its critics a decade ago. Far from a great strain on infrastructure investment, network capacity, and innovative activity, NN rules have had no negative effect on the telecommunications sector in these areas. The sector has thrived while edge services have opened an entirely new economy bringing millions of new jobs and hundreds of thousands of new businesses to our economy. Net neutrality has been crucial for that development.