Direct-sell company Tupperware (TUP) offers two characteristics that income investors find desirable. First, earnings growth is stable. The five-year EPS Stability Factor is 4 on a scale that runs from 0 (calm) to 99 (wild). Second, the dividend shows growth. The quarterly payout has increased from 22 cents a share to 36 cents a share from 2009 to 2012 -- a 64% increase in roughly three years. The annualized yield is 2.2%. Yet, two other factors