"We treat all countries equally in our research, and the Doing Business indicators and methodology are designed with no single country in mind but so that the overall business climate can be improved," the World Bank said in a statement.
Romer had cast doubts over Chile's ranking and had not said anything on India, which in the latest ranking jumped 30 places to be ranked 100th out of 190 countries after it implemented reforms in most indicators, including starting a business, getting credit, paying taxes and resolving insolvency.
In Chile's case, however, the methodological changes could have been politically motivated, and that it was not driven by an actual deterioration in the South American nation's business environment, he had reportedly said.
"Over the 15 years of its existence, the Doing Business Index has been an invaluable tool for countries looking to improve their business climate, tracking thousands of reforms," the World Bank said.
Since then, 'doing business' has undergone a number of reviews - both internal and external - and "we are always looking for new ways to refine and strengthen its methodology," the bank said.
"Any changes to the Doing Business methodology are done through a rigorous consultative process, where our Board, individual countries, practitioners, academics, and staff across the Bank Group can provide input.
"The indicators are based on hard data, such as actual tax rates and legislation passed, and they are subjected to internal and external validation. Objective data is not subject to political influence," it said.
On concerns expressed by Romer, the World Bank said it "will conduct an external review of Chile's indicators in the Doing Business report".
While Chile's rank in the World Economic Forum's global competitiveness report has hovered between 33 and 35 in the past five years, its 'doing business' position has been more volatile.
Since 2006, Chile's presidency has alternated between socialist Michelle Bachelet, who was in office from 2006 to 2010 and from 2014 to now, and pro-business Sebastian Pinera, who was in office from 2010 to 2014.
Chile's ranking rose to 34 under Pinera and fell to 57 during Bachelet's two terms.
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