Cowen argues that studies on what people are wiling to pay for the internet (if they had to) show that it can't be helping that much. It's true that the overall effect is hard to measure though.
I've seen those studies and his discussion of them. They all show that people would have to be paid a lot to stop using the internet (and they'd still be benefiting from its side effects), and they'd pay a lot if that were the only option. That indicates a huge consumer surplus, since you don't have to pay a lot for a base level of internet access.
Cowen's only response to any of that is to look at measures that gauge the marginal value of the last unit of internet usage (which of course nets out to zero) is low, when we really care about the consumer surplus it generates, which is completely different from (and reflected in different measures than) marginal value.
SIAI benefactor and VC Peter Thiel has an excellent article at National Review about the stagnating progress of science and technology, which he attributes to poorly-grounded political opposition, widespread scientific illiteracy, and overspecialized, insular scientific fields. He warns that this stagnation will undermine the growth that past policies have relied on.
Noteworthy excerpts (bold added by me):
In relation to concerns expressed here about evaluating scientific field soundness:
Grave indictors:
HT: MarginalRevolution