A boost in equipment sales propelled Caterpillar's first-quarter profit, as a strong global economy helped support construction and energy industry projects. The maker of heavy equipment and machinery also greatly increased its outlook for the year, citing an upbeat global markets, better pricing and demand. Profit rose eightfold to $1.67 billion, or $2.74 per share, while revenue surged 31 percent to $12.86 billion.Read more on NewsOK.com