New proposed legislation would make it illegal for one company to own both a pharmacy and a pharmacy-benefit management company. A PBM helps health insurers manage their prescription drug benefits and negotiates prices and rebates; CVS has both pharmacies and a benefit management division, as does Cigna and UnitedHealth. But some federal lawmakers see a conflict of interest. Also: the eco-friendliness of small SUVs and the future of Nasdaq board diversity rules.