To ensure that H u and H d get a non-zero vacuum expectation value after electroweak symmetry breaking, μ should be of the order of magnitude of the electroweak scale, many orders of magnitude smaller than the Planck scale (M pl), which is the natural cutoff scale. This brings about a problem of naturalness: Why is that scale so much smaller than the cutoff scale? And why, if the μ term in the superpotential has different physical origins, do the corresponding scale happen to fall so close to each other?