There has long been a debate over the benefits of individuals buying annuities products for their retirement needs. But Motley Fool contributor Jessica Alling shows investors a way to jump in on the recent spike in demand for annuities without actually having to buy a single product. Jessica discusses the opportunities available for big insurers and other retirement solutions firms, like AIG (AIG -0.14%), ING U.S. (VOYA 0.35%), MetLife (MET -0.41%), and SunLife Financial (SLF -0.47%), while also giving investors some perspective on which firms are likely to come out ahead of the pack.