"Congress is considering whether to replace the 'cash cliff' for Social Security Disability Insurance (DI), under which beneficiaries lose their entire benefit if they earn more than $1,090 a month for a sustained period, with a 'benefit offset,' under which DI benefits would gradually decline as earnings rise. Proponents of such a change often describe it as a way to reduce work disincentives and spur more work. Eliminating the cash cliff and substituting a gradual benefit reduction ... could result in a net decrease in work, harm vulnerable beneficiaries, and increase DI overpayment rates."