By Tatiana Bautzer NEW YORK (Reuters) - Citigroup Chief Financial Officer Mark Mason said at a conference in New York that investment banking fees and market revenue are expected to rise by mid-single digits in the third quarter compared to a year earlier. Mason also said the global revenue and expenses for the year may be higher than the guidance of $84 billion and $54.3 billion, respectively. But Mason added the proportion between expenses and revenue did not change, so the impact of the higher numbers ...