much harder than the average. >> reporter: frank koller says the u.s. labor movement may also be partially responsible, long ago opting for income security over the job security at non- union lincoln. >> income security implies that you're guaranteed a certain hourly wage. let's say in an auto factory in detroit, the idea of employment security is that you will always have employment but that in tough times because the company is not doing so well, your income is going to decline and that in good times it will increase again. now ultimately the idea of income security won out. >> reporter: as did, on wall st., the idea of income for shareholders. harvard business school professor norm berg, who's taught lincoln as a case study for decades, says wall streets increasing stress on maximizing shareholder value has fought the profit-sharing, no-layoff model. >> if you ask the financial community, they would say this is practically traitorous. it's like a bumblebee, it's not supposed to fly, you know? >> reporter: or, as a wall street investment banker said o