Google’s recent moves have stirred concern in industries from book publishing to telecommunications. Businesses already feeling the Google effect include advertising, software and the news media, real estate and auto sales.

Google could extend its economic reach in the next few years as more people get high-speed Internet service and cellphones become full-fledged search tools, according to analysts. And ever-smarter software, they say, will cull and organize larger and larger digital storehouses of news, images, real estate listings and traffic reports, delivering results that are more like the advice of a trusted human expert.