Before Ana married her husband, Anthony, she hired him as her gardener. After they were married, Anthony still did the gardening, but Ana no longer paid him. Assuming nothing else changed, GDP would be when they are married compared to when Ana was single. Before Anthony was Ana's gardener, he lived in Colorado and grew and sold marijuana. This was before it was legalized in 2014. Suppose he continued to grow and sell marijuana after it was legalized. Assuming nothing else changed, Colorado's GDP would be once marijuana was legalized.