A homeowner is considering investing in a solar power system. He learns that having the panels installed will cost about $30,000 and that it will take several years to recoup his investment in utility savings. He also learns that his state offers a 30 percent tax rebate on installation costs and the value of his home will increase significantly. The tax benefit and improved home value are examples of ______.

		absolute advantages
		comparative advantages
		negative incentives
		positive incentives