There’s no shortage of economic uncertainty for the country’s small businesses, but many are surprisingly upbeat about the year ahead. A source for that optimism: artificial intelligence. That’s what Goldman Sachs (GS) found in a survey of some 1,400 small business owners — and shared exclusively with Yahoo Finance ahead of the bank's 10,000 Small Businesses summit in Washington, D.C., this week. The results: Most small business owners (78%) say they're optimistic about the next year despite there being ...