(Reuters) - France plans to ban “buy one, get one free” offers on food products in supermarkets to guarantee better income to struggling farmers, in a move that could also test President Emmanuel Macron’s free-market credentials.

The move is part of a wider food and farming bill, presented to cabinet on Wednesday, which aims to raise regulated minimum food prices and limit bargain sales in France, the European Union’s largest farm producer.

Farmers, an important constituency in French politics, have long complained about being hit by a price war between retailers that they say benefits consumers but hurts producers.

“It will be a breath of fresh air for retailers, who will be able to trim their margins on other products and pay producers better,” Agriculture Minister Stephane Travert told reporters, adding that non-food products would not be affected.

Banning “buy one, get one free” bargains, which are less common in France than in countries such as Britain, will also help fight against food waste, he said.

The proposed legislation will effectively prohibit “buy one, get one free” offers by barring supermarkets from making discounts of more than 34 percent. But “buy two, get one free” discounts would still be allowed, Travert said.