Sentence:  'Meta' means 'related to or extension of the main body' and that is what the <WSD>metamarkets</WSD> are: that group of producers and/or suppliers of goods and services who cannot easily be classified in the other main markets, such as charities, government servicers, clubs, political parties, institutes and associations, unions, etc. Unlike organisation in other markets the organisations within the metamarket to not always aim to make a profit surplus to their operation costs. 
Meaning of the word marked with <WSD> tags:  The process of promoting the exchange or adoption of things other than goods or services that are offered for sale.