BUENOS AIRES, Argentina (CNN) -- As a strike by farmers continued for a 13th day Tuesday with no solution in sight, its impact was visible on meagerly stocked supermarket shelves in cities.
A demonstrator bangs a pot in support of striking farmers in Buenos Aires, Argentina, on Tuesday.
Butchers and supermarkets were among the first hit.
"We are looking for alternative suppliers because within 24 to 48 hours, we will have no more meat," said Miguel Calvete, who runs a Chinese supermarket in the capital.
Hundreds of Argentines took to the streets of the capital, where they banged pots and pans in support of the striking growers, who are protesting an increase in export taxes for their products.
One economist warned that the strike could result in more serious problems than short-term scarcity.
"The most dangerous [scenario] is that there might also be problems of inflation with supply, which is a type of combustible that generates more inflation," said Jorge Colina. "The fewer products and goods available to place on the shelves, the more room for increasing prices."
Argentine President Cristina Fernandez was unswayed, referring to the growers' demands as "extortion" and saying the increases on agricultural products are justified. Watch farmers protest rise in taxes »
"It is the sector that exports almost everything," she said. "About 95 percent of soybeans are exported. They're not exported in Argentine pesos, they're exported in euros, in dollars. But the costs are Argentine costs."
The farmers' federations, for their part, announced that the strike will continue for an indeterminate period of time.
"We thought this was going to generate a conciliatory discussion, but it has had the opposite effect," said Alfredo Rodes, executive director of the Confederation of Rural Associations of Buenos Aires and La Pampa.
He said the taxes go directly to the central government, not to the provinces where the farmers live, and he accused the government of demanding "practically half" of farmers' production in taxes.
His group, which organized roadblocks, posted where they would be on the Internet.
But traffic jams still occurred, inconveniencing many people.
"They have to try to resolve this as soon as possible," one woman said. "There are kids who are trying to get to school, and they're not arriving." E-mail to a friend
CNN's Javier Doberti contributed to this report.
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