This New Yorker cartoon by Trevor Spaulding is cute, but – spoiler alert – it’s not quite right. A company offering a 401(k) retirement savings plan to its workers is a good thing, but it’s no “favor,” noted my long-time editor Steve Sass, an economist with a hawk eye for inaccurate retirement information. Setting up and funding a 401(k) is a big expense for employers. But many think it is worthwhile, because 401(k)s – and, more so, employers’ matching contributions – help them attract and retain the sharpest, most productive, or most-skilled workers. Another employer calculation is that the income tax deduction employees get for saving, which costs the employer nothing, is especially valuable for those on the payroll who…