The "lisp is the most productive language on Earth" claim is mainly a selective bias. People who are good with their tools are very productive. Naturally they

The "lisp is the most productive language on Earth" claim is mainly a selective bias. People who are good with their tools are very productive. Naturally they view their own tools as superior. One of the biggest Lisp proponents (forgot his name) when joining Google found out that other good developers using other languages were just as productive.