The Fed's new chapter runs through Walmart's ex-CEO

When Mike Allen and I are curious about the "real economy," we talk to sources at big-box stores for a read on real-time sales trends, or friends at super-regional banks to gauge the mood and money movement. To us, that's the real world and real data, imperfect but less imperfect than dated Bureau of Labor Statistics surveys built for a different time and economy. Why it matters: Fed Chair Kevin Warsh will get scrutinized like hell for rate changes, his communication style, his vow of a…