4 ms·

I'm sure people would take an ad-subsidized car (or ride). Nielsen pays people to walk around with radio tracking devices.

• mikelyons 10y ago
  Got a link to info about this?
  • exclusiv 10y ago
    Yeah it's the portable people meter - https://en.wikipedia.org/wiki/Portable_People_Meter https://en.wikipedia.org/wiki/Portable_People_Meter