I haven't read Huff's book so here's my stab in the dark. Europe has a lot of mainland coastline and the Mediterranean, which favors the formation of many small nation states and trans-Mediterranean trade. Among a large number of diverse and competing states, political, military and social ideas are more likely to be employed somewhere, and if successful, will rise to prominence within the local trade cluster by the process of natural selection.
If you have a large number of independent nation states, many of which import products and ideas from the far East, one of them is likely to put together a new military innovation that gives them an edge in warfare. Since the area sees frequent competition, other nations will quickly come into contact with the new technology and be forced to adopt it, or risk swift decline. A period of rapid innovation in metallurgy, chemistry and navigation (to name only a few) would develop a political culture that values technological development over traditional ideals.
I guess this would increase the demand for scientists/intellectuals and engineers. The total fund allocated by the political elite towards academics either through patronage or universities would increase the number of scientists in Europe. Ease of communication through mail channels and access to wider array of materials, both developed due to the increased volume of trade, would allow more scientists, to do more complicated research and exchange ideas more easily than ever before.