Module 4 · Auction Completion & Migration
Excess & Tails
Aggressive rejection that completes an auction.
In this lesson you'll
- Define excess and buying/selling tails
- Understand excess as auction completion
- Spot a finished vs unfinished extreme
Tails show which auction completed:
- Buying tail (at the bottom): single prints where aggressive buyers rejected lower prices → marks the end of a down-auction (a completed low).
- Selling tail (at the top): single prints where aggressive sellers rejected higher prices → marks the end of an up-auction (a completed high).
Key takeaways
- Excess = aggressive rejection that completes an auction (a tail/single-print spike).
- Buying tail (bottom) completes a down-auction; selling tail (top) completes an up-auction.
- A healthy session shows tails at both extremes.
- No tail at an extreme = unfinished auction, likely revisited.
Check your understanding
Pick an answer to reveal instant feedback. Answer every question to complete the lesson.
Why that's off: A tail is the signature of a FINISHED auction, not an unfinished one.
Why that's off: Buyers, not sellers, created the rejection at the lows.
Why that's off: The POC is a high-volume node, not a thin tail.
A buying tail is excess at the lows — aggressive buyers emphatically rejected cheaper prices, completing the down-auction. It marks a finished, more trustworthy low.
Why that's off: A completed auction shows a tail; a flat extreme does not.
Why that's off: The strongest reversal comes WITH excess, not without it.
Why that's off: Flat extremes (poor highs/lows) are common.
No excess/tail means the auction wasn't aggressively rejected — it's unfinished business the market tends to return to and repair before a durable reversal.
Educational content only. Nothing here is financial or trading advice. Order-flow and options patterns shift probabilities; they never guarantee outcomes.