A rising number of Greeks in rural areas are swapping goods and services in cashless transactions.
A second vote will be held on Wednesday, on measures including justice and banking reforms, when a similar outcome is expected.
Greece awoke with a political hangover on Thursday after parliament approved a stringent bailout programme, thanks to the votes of the pro-European opposition, amid the worst protest violence this year.
Prime Minister Alexis Tsipras battled to win lawmakers' approval on Wednesday for a bailout deal to keep Greece in the euro and avoid bankruptcy, as the IMF pressured Greece's creditors to provide massive debt relief for its crippled economy.