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None of it has cost him a euro, because he had previously done a spot of electrical work – repairing a TV, sorting out a dodgy light – for some of the 800-odd members of a fast-growing exchange network in the port town of Volos, midway between Athens and Thessaloniki.

In return for his expert labour, Mavridis received a number of Local Alternative Units (known as tems in Greek) in his online network account. In return for the eggs, olive oil, tax advice and the rest, he transferred tems into other people’s accounts.

“It’s an easier, more direct way of exchanging goods and services,” said Bernhardt Koppold, a German-born homeopathist and acupuncturist in Volos who is an active member of the network. “It’s also a way of showing practical solidarity – of building relationships.”

He had just treated Maria McCarthy, an English teacher who has lived and worked in the town for 20 years. The consultation was her first tem transaction, and she used one of the vouchers available for people who haven’t yet, or can’t, set up an online account.

“I already exchange directly with a couple of families, mainly English teaching for babysitting, and this is a great way to extend that,” said McCarthy. “This is still young, but it’s growing very quickly. Plainly, the more you use it the more useful to you it gets.”

Tems has been up and running for barely 18 months, said Maria Choupis, one of its founder members. Prompted by ever more swingeing salary cuts and tax increases, she reckons there are now around 15 such networks active around Greece, and more planned. “They are as much social structures as economic ones,” she said. “They foster intimacy and mutual support.”

The network is currently busy transforming a disused building owned by Volos university into a permanent exchange and barter space. It will host a daily market from next month at which members can meet and exchange without using cash. Several highly successful open-air markets were held throughout last summer, Choupis said, until the weather got too cold.

“They’re quite joyous occasions,” she said. “It’s very liberating, not using money.” At one market, she said, she approached a woman who had come along with three large trays of homemade cakes and was selling them for a unit a cake. “I asked her: ‘Do you think that’s enough? After all, you had the cost of the ingredients, the electricity to cook …’

“She replied: ‘Wait until the market is over’, and at the end she had three different kinds of fruit, two one-litre bottles of olive oil, soaps, beans, a dozen eggs and a whole lot of yoghurt. ‘If I had bought all this at the supermarket,’ she said, ‘it would have cost me a great deal more than what it cost to make these cakes.'”

What rules the system has are designed to ensure the tems continue “to circulate, and work hard as a currency”, said Christos Pappionannou, a mechanical engineer who runs the network’s website using open-source software.