* Airlines that charge different fares for the same journey at different seasons of the year.
* Universities that charge higher fees to overseas students than to home students.
* Restaurants that offer ‘early bird’ dinners.
* Professional people, like doctors, accountants and consultants, who charge richer clients higher fees than poorer clients for the same service.
* Exporters who charge lower prices abroad than they charge domestically.
* Prestige outlets that charge higher prices than high street or discount stores for the same products.
* Health clubs that sell off-peak memberships.
* Supermarkets that offer points or reward schemes to regular shoppers.
* Happy hour.