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Czech leader's planned spending spree has some people worried

* Draft budget shows extra spend of 2 percent of GDP

* New budget council warns against new mandatory spending

* PM Babis, some economists say economy can support it

* Graphics: spending plans https://reut.rs/2JAFb9l; budget https://reut.rs/2LwOZ5V; debt https://reut.rs/2L3YwFt

By Robert Muller and Jason Hovet

PRAGUE, Aug 3 (Reuters) - Leaders tend to rein in generous election promises once they come to power; few tour the country adding more, as Czech Prime Minister Andrej Babis has been doing.

The billionaire businessman says the strength of the economy allows for what is set to be a record spending spree.

Some, including the lead economist advising the parliament-appointed National Budget Council, are not so sure, and worry that Babis may undo the gains from years of belt-tightening when he was finance minister.

The European Union welcomed that frugality. With the bloc at odds with post-communist members Poland and Hungary over anti-establishment leaders' approach to the rule of law, it does not want weakening Czech finances to worry about.

Babis won a clear lead for his anti-establishment Action for Dissatisfied Citizens (ANO) party last October by promising to increase state salaries and pensions, boost healthcare spending and upgrade shoddy roads.

Now his spending pledges are being incorporated into his government's first budget, and a Reuters analysis points to the biggest spending rise in the country's modern history of about 4 billion euros ($4.69 billion), or 2 percent of output.

The sums include hefty rail subsidies for older people and students, increasing teachers' wages and more military spending.

Some experts say the country's finances are healthy enough to justify this - it has a solid credit score from both major rating agencies.

However, the chief economist advising a new state budget overseer told Reuters he was concerned the spending might weaken state finances just as economic growth begins to falter.

"The government has been so generous at the start of the election cycle," said the economist, Pavel Sobisek from Italian lender Unicredit.

In common with other anti-establishment leaders, Babis rose to prominence by pledging to weed out perceived elitism and corruption.

For months, politicians thwarted his attempts to form a government, citing concern over a charge against him, made just before the election, of alleged fraud to obtain EU funds.

He denied the charge, calling it a political ploy, and boosted his public support with a new campaign-style tour starting in March and lasting through the spring in which he pledged to fund local projects including a new hospital wing, theatre and sports arena.