Think about all of the bullshit the person would go through to do even the most mundane tasks. Gotta wear specific kinds of clothing that won't tear since gold is really soft. If they walk around barefoot do they leave golden footprints, or does the effect spread further? What happens if/when they ruin the global economy by making gold have no value? If they get hit by a flying object that then turns into gold, does it have the same mass as before, making the impact force the same as if it weren't made of gold, or does the mass adjust up/down which would change how hard the impact was?