Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Advertising Executives Point to Five Ways Google Stifles Business Reuters SAN FRANCISCO / NEW YORK - U.S.authoritiesinvestigating Alphabet Inc.'s Google foranti-competitive behavior have recently begun probing thecompany's $116 billion-a-year advertising business. Attorneys general for 50 U.S. states and territories alongwith the U.S. Department of Justice appear to be acting onaccusations from rivals, lawmakers and consumer advocacy groupsthat the biggest seller of online ads engages in unfair tactics. Google disputes its dominance. "Ad tech is a very crowded field, and Google competes withhundreds of companies, including household names like Adobe,Amazon, AT&T, Comcast, News Corp.and Verizon," company spokesmanJosh Zeitz said. "Publishers and advertisers mix and matchtechnology partners to meet their different needs, creating bothcompetition and innovation." Later, in response to this story, Google reiterated in ablogpostthat its services foster competition. "Our tools and platforms make it easy for advertisers andpublishers ofall sizes to choose whom they want to work withinthisopen,interconnected ad system," Google Vice PresidentSissie Hsiao wrote. Here are five common concerns about Google raised by 10 adindustry executives, most speaking on the condition ofanonymity. .