Patenting in software, cloud computing, and artificial intelligence has grown rapidly in recent years. Such patents are acquired primarily by large US technology firms such as IBM, Microsoft, Google, and HP, as well as by Japanese multinationals such as Sony, Canon, and Fujitsu. Chinese...

We adjust the US stock-exchange listing count for all significant transactions that move corporate assets into or out of the stock market - in particular mergers and acquisitions. In contrast to the actual listing count, the US merger-adjusted count hardly peaks over 1980--2017 and does not...