effectiveness in  business is governed by a weighted average of skills against a backdrop of economy and politics

effectiveness as a programmer, or a job, depends on one skill against a backdrop of economy and politics

therefore business is robust, because a loss, failure, or tragedy in one area won't kill you but the rest of your skills will keep you alive, while the experience makes you stronger

a job isn't robust, because each loss, failure, or tragedy, takes you further out of the race and away from the edge (hardwood-bigend edge)