Commentary It’s open enrollment season for Medicare. Local TV stations and cable networks are flooded with ads for various insurance supplements. They promise “free” dental care, free transportation to doctors, free drugs, free dentures, and lots of other free stuff. Paid spokespersons speak of “benefits” and “entitlements.” They say subscribers could receive as much as $100 a month back into their Social Security checks. Even the phone number to call to sign up is “absolutely free.” Read the small print and you’ll find that some of the plans vary by region, some by ZIP code. Sometimes there’s a nominal cost, so it’s not actually “free.” Call a “licensed” insurance agent for more details. Licensed by whom? Probably the companies selling the plans. Some of the ads pay aging celebrities like quarterback Joe Namath, basketball legend Earvin “Magic” Johnson, and comedian Jimmie Walker to pitch their products. Notice the use of …