Central planning seldom makes economic sense. However good a scheme looks on paper in some politician’s office, planned on the taxpayer’s dime, it's probably not worthwhile. If it really was a good scheme, then private enterprise would have already implemented the project.
Government never “stimulates” economic growth. Left quite alone, people engage in rational commerce guided only by enlightened self-interest. More crucially, government cannot predict the real consequences of its efforts to stimulate the economy. Republicans around the country are telling Americans that the ocean of dollars which the federal government spent on the future credit of our children in order to stimulate growth in America is actually being spent in China.