You say that supermarkets have similar yields. Are you talking about Woolworths & Coles having similar yields to each other or to CBA?
Either way it is irrelevant. They are different businesses with CBA reliant on interest on money borrowed & interest they charge.
Woolworths & Coles have almost a duopoly. The only serious competitor is Aldi & they do not have stores in every shopping centre to make much difference. Banks have competition in nearly every shopping centre.
Woolworths' yield, based on the last interim & final dividends, is 4.3% on yesterday's closing price. Coles' yield is 3.73%. CBA's yield, after the price falling about $11 is 3.46%. Yield still too low.
CBA Price at posting:
$134.35 Sentiment: Sell Disclosure: Held
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.
(20min delay)