Price history and party control
≤30-day span 31–180-day connection reading / boundary · >180 days: gap
Lowest advertised in-stock price per round, before shipping and tax. Includes remanufactured,
bulk and limited-quantity listings; the cheapest product can change between readings.
Ribbons: blue = Democratic, red = Republican; numbers identify Congress.
Vertical dashed markers: general elections. Statistics use stored readings.
Price changes around elections
Day 0 = election. Change from each caliber's mean price in the preceding 90 days (observation-weighted, excluding election day). Vertical scales vary. Neutral line: median of per-caliber medians in 15-day buckets, with at least two calibers. +90 days covers +82.5 to <+97.5 days. Caliber coverage and baseline sample sizes vary.