Dunne, Roberts, and Samuelson examined manufacturing industries in the 1960s to 1980s. Do you think that entry and exit rates have changed in the past two decades?

Dunne, Roberts, and Samuelson examined manufacturing industries in the 1960s to 1980s. Do you think that entry and exit rates have changed in the past two decades? Do you think that entry and exit rates are systematically different for service and retail industries?