Heteroscedasticity

  1. U.S. monetary policy effects on inflation appear to have strengthened
    Machine learning analysis reveals strengthened monetary policy transmission but flattened Phillips curve dynamics, with regime-dependent behavior during post-pandemic inflation.
  2. Infinite-mean durations found in five cryptocurrency ETFs
    Asymptotic theory for integrated autoregressive conditional duration models reveals infinite-mean trading intervals in cryptocurrency ETFs, requiring new inference methods.
  3. Peru mining GDP and terms of trade show a stable long-run link
    Analysis of Peru's mining sector reveals stable long-run equilibrium with global prices, yet slow adjustment to shocks reflects structural rigidity beyond commodity cycles.