Building a major pipeline to carry stranded North Slope natural gas to market would boost the number of jobs and wealth in Alaska. But the impact would be muted compared to the economic upheaval from building the trans-Alaska oil pipeline 35 years ago. That's a key conclusion of a draft economic analysis,prepared by the gas line project developer and released Jan. 13, that forecasts how life in Alaska would change if the proposed $32 billion to $41 billion pipeline from the North Slope to Alberta gets built.