By William Horobin and Stacy Meichtry 

PARIS--France's Economy Minister on Thursday announced a EUR6 billion plan to stoke domestic demand and calm Socialist-Party ranks unhappy with President François Hollande's focus to date on deficit reduction.

In an address laying out a road map for the euro-zone's second-biggest economy, Arnaud Montebourg proposed tapping the brakes on France's drive to narrow the public deficit and vowed to clear away costly red tape that shields professional guilds from competition.

The announcement marked a subtle, yet highly symbolic shift away from the policies of Mr. Hollande, a Socialist, who has tried to persuade French companies to increase hiring by lowering their tax bill. Since the start of the year, Mr. Hollande has also taken a scalpel to France's bloated public sector, forging a plan to implement EUR50 billion in spending cuts over the next three years.

"I propose changing our macroeconomic policy," Mr. Montebourg said "It's not a question of abandoning the efforts on public spending. It's a question of making them more useful, more productive and better orientated toward growth."

It wasn't clear if Mr. Montebourg was acting with the president's blessing. The minister was flexing his muscles for the first time in his new role as steward of the French economy. Earlier this year, Mr. Hollande reshuffled his cabinet, placing the firebrand left-wing politician atop the economics ministry in addition to his previous role as industry minister. Mr. Hollande's office didn't respond to requests for comment.

Mr. Montebourg said a third, rather than roughly half, of Mr. Hollande's planned spending cuts should go toward reducing the deficit. The remaining two thirds, he said, should be split evenly to fund tax cuts for households and businesses.

Mr. Montebourg also vowed to pass a law slashing red tape and liberalizing professional services that the European Union says are weighing down the country with cartellike practices. French economic growth ground to a halt in the first quarter of this year, after growing just 0.4% last year.

"Numerous professions in monopoly situations are capturing the population's income," Mr. Montebourg said. The minister said the planned law liberalizing professional services would free up EUR6 billion for consumer spending, though he didn't provide specifics on how that would be achieved.

In recent months, Mr. Montebourg has focused his energy on assuring France keeps its industry intact and jobs at home, waging a battle to extract concessions from General Electric Co. in exchange for granting the American industrial conglomerate permission to buy most of French power and rail engineering group Alstom SA's assets.

With the battle over Alstom behind him, Mr. Montebourg is pivoting to France's beleaguered economy. At one point in his address on Thursday, the minister took up the mantle of New Deal economics, evoking the massive public spending programs that President Franklin D. Roosevelt implemented in the 1930s to claw the U.S. out of the Great Depression. "President Roosevelt said: 'Try something, and if it doesn't work try something else.' We too we will try something different from European austerity," Mr. Montebourg said.

Ignoring European etiquette that discourages national policy makers from publicly pressuring monetary authorities, Mr. Montebourg singled out the European Central Bank for criticism, accusing the Frankfurt-based institution of not doing enough to stimulate Europe's economy. Mr. Montebourg demanded the ECB drive down the value of the euro and move to buy debt issued by euro-zone countries, so-called quantitative easing, to spur economic growth.

As industry minister, Mr. Montebourg long argued that ECB policies were keeping the euro high and making French exports more expensive. But the minister had appeared to temper his criticism last month after the ECB cut its interest rates to record lows and outlined a plan to encourage bank lending to businesses.

On Thursday, however, Mr. Montebourg reignited his criticism, demanding the central bank stem European disinflation that effectively is leaving French firms with pricing constraints that erode their profit margins.

"In a context where inflation is historically weak it is inevitable and unavoidable that the ECB asks itself questions and goes even further in nonconventional monetary policy by at last buying public assets if the euro still doesn't fall and growth doesn't pick up in the euro zone," Mr. Montebourg said, adding ECB is failing to fulfill its mandate of keeping inflation just below 2%.

"We have an ECB that doesn't respect its mandate of 2% [inflation] as we are at 0.5% today, and the situation has become dangerous in terms of deflation risk," Mr. Montebourg said.

An ECB spokesman had no comment.

Write to William Horobin at William.Horobin@wsj.com and Stacy Meichtry at stacy.meichtry@wsj.com

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