punters into paying over the odds for goods - then run bogus money-off deals on the same products in a ploy called ping-ponging.
We passed our findings to Office of Fair Trading watchdogs who have begun their own investigation into ping-ponging.
The one-two punch of avocado and salsa wilt keep your taste buds happily ping-ponging
between creamy and zingy.
For the new study, researchers used two powerful desktop computers to simulate the tracks of hundreds of individual rocks flying off the surface of Mars, Mercury or the moon and ping-ponging
through the solar system.