Rosetta Stone claims to be the fastest way to learn a new language. I just heard their ad on TV.
What is the average ROI (return on investment) for a Rosetta Stone purchase?Is it possible to add up all the money spent by people who buy the system, and compare that to the number of learners who continue long enough to learn a new language. I wonder how the return on the investment in a Rosetta Stone system compares with the return on investment in other language learning solutions including schools, books and online options like LingQ. Some third party should do a study, in the public interest.