March 18 (Reuters) - The following are the top stories on the New York Times business pages. Reuters has not verified these stories and does not vouch for their accuracy.
- A Citigroup report on 20 nations said pension obligations, much of them unfunded, amounted to nearly twice the countries' total national debt. (nyti.ms/1R2bBtV)
- After failing to obtain approval for its Keystone XL oil sands pipeline, TransCanada Corp said on Thursday that it would buy the Columbia Pipeline Group for $10.2 billion. (nyti.ms/1R2ccM2)
- Abengoa SA's global ambitions are now the source of its troubles as it tries to avoid what would be the largest bankruptcy in Spanish corporate history. (nyti.ms/1R2bzlF)
- Gustavo Martinez, the chief executive of the advertising agency J. Walter Thompson, who was accused last week of racist and sexist behavior in a lawsuit that raised questions about the culture of Madison Avenue, has resigned. (nyti.ms/1R2bFKc) (Compiled by Ismail Shakil in Bengaluru)