While outstrip might make you think about undressing, it really means outdoing. If the productivity of your garden outstrips your neighbor's, expect the neighborhood to come calling for fresh vegetables.
If one thing outstrips another, it exceeds it or goes beyond it. When you outstrip someone during a race, you pass them. When one company’s profits outstrip another’s, they make more money. When the productivity of one nation outstrips the neighboring nation, they will have a bigger Gross National Product.