Bartering may figure into variants of PM such as flea markets and swap meets. In our town, there is a fellow who sells "junk silver" (old silver-bearing US coins) and encourages there use as "alternative money" (to Federal Reserve Debt Notes). One fellow in town that I know of accepts the silver coins as payment; others probably would if asked.
People's Markets are an age-old tradition world wide; this from wiki:
Britain's market traders
As the first real form of retailing,not a great deal has actually changed. Many people have tried their hand at Market trading and some have made vast fortunes, Marks and Spencers, Tesco, New Look all started from a barrow or stall. The life is tough and the hours can be very long but there are certain families who have been involved with the industry,for many generations and usually linked to the same trade or line. Halkets is one of these, based around Stoke on Trent,are famous for selling "pots" (china and pottery) at markets and fairs up and down the country. Benjamin is also another old family name connected with the markets and fairs,these seem to still operate around the London and Oxford areas and are involved with the selling of small leather goods,handbags and lugggage.
[edit] Greece
Main article: Laiki agora
Street markets in Greece are called laikes agores (λαϊκές αγορές) in plural, or λαϊκή αγορά (laiki agora) in singular, meaning "people's market". They are very common all over Greece, including the capital, Athens, and its suburbs. Regular (weekly) morning markets sell mostly fresh produce from farming cooperatives - fruit, vegetables, fish and flowers/plants. Some household items and prepared foods are often available.
Annual street markets (panigyri(a)) occur around churches on the day of their patron saint. These take place in the evenings and have a more festive character, often involving attractions and food stalls. The goods sold range from clothing and accessories to household items, furniture, toys and trinkets. Athens also has several bazaars/enclosed markets.
[edit] Hong Kong
See: markets in Hong Kong
Street markets in Hong Kong are held all the days except few traditional Chinese holidays like Chinese New Year. Stalls opened at two sides of a street were required to have licenses issued by the Hong Kong Government. In Hong Kong there are street markets of various kinds such as fresh foods, clothing, cooked foods, flowers, and even electronics. The earliest form of markets is known as Gaa si. ...
[edit] London
See: markets in London
Some examples of street markets include Berwick Street Market, Broadway Market, Camden Market, East Street Market and Portobello Road Market. There are many markets in London just a few mentioned above but the most popular is Borough Market which sell most fresh produce as well as having a bakery.
[edit] North America
Farmers' markets are usually held outdoors, in public spaces, where local farmers can sell produce to the public.[1] They are increasing in the United States and Canada.
[edit] Turkey
Street markets are called shortly pazar in Turkish and usually named after the name of the day since they are only installed at around 05:00 on that specific day and ended on same day around 18:00, in every week. Every district in Turkey has its own open market where people can choose and buy from a very wide range of products, from fresh fruits and vegetables to clothing, from traditional white cheese (which some people may consider feta-like) to household items.