Mmm, cookies for Harvard faculty, again?
Step 1: Find a 3-form which when taken as the Lagrangian of a quantum gauge field leads to a generating functional that is a manifold invariant.
Step 2: ???
Step 3: Profit!
Geez folks ... apply Bayesian logic for heavens sake ... the probability is overwhelmingly high that most of the money to be made from algebraic geometry has not yet been made.
Exercise: work out how it will be made. :)