Caterpillar Inc CAT.N slipped 4.0% after the world's largest heavy-duty equipment maker warned of margin pressure from higher production and labor costs. By Devik Jain and Bansari Mayur Kamdar Jan 28 (Reuters) - The Nasdaq was set to open higher on Friday after stellar results from Apple Inc, while the latest reading of the Federal Reserve's preferred gauge to measure inflation eased concerns around faster interest rate hikes. "While it doesn't feel fun, we are exiting a period of 0% interest rates and trillions of dollars in Fed asset purchases," said Darrell Spence, economist at Capital Group.