As economist John Williams observes, "starting in October, a divergence developed: Whereas year-to-year change in BLS estimated payroll earnings continued at a more-or-less constant, positive level, tax receipts fell quite markedly. Where the Treasury numbers reflect full reporting, the BLS data are sampled, heavily modeled and usually heavily revised. The implication is that the BLS has overstated average earnings and payrolls meaningfully in recent months."