Which government intervention scheme is the best?

1. the floor changes QS, the subsidy will change S. Quota, it depends on the world price beforehand.
2. since the floor will lead to a surplus, which must either be thrown out or purchased by the government, the subsidy will increase TR, but compare that to how you were taught Quotas, for a comparison (probably subsidy tho).
3. Depends on if the govt buys the excess in the Pfloor scenario, otherwise subsidy.