30 ms·
link should be (http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivity_Meter http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivi...)
by polymatter 13y ago
link should be (http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivity_Meter http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivi...)