What does Happy's "brilliant" business plan for the Loman Brothers--success as sporting goods salesmen--tell us about him?in Death of a Salesman

Happy's brilliant plans usually depend on him taking from
other people. The basis of the plan, revealed in Act 1, is
that-

We form
two basketball teams, see? Two water-polo teams. We play each other. It's a million
dollars' worth of publicity. Two brothers,
see?

What Happy is unable to
'see' is that no-one cares about the loman Brothers. No-one sides with them. The are not
popular, well-known or even - in Willy's terms - 'well-liked'. Happy has only ever lived
in his brother's shadow. It is Biff who will be expected to put the investment idea to
Bill Oliver, and as a thief, Biff has no substance as an investment
project.

We see that Happy has inherited his father's
misguided optimism and elevated sense of self importance.