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Finance Lessons

MEV & Transaction Ordering

MEV & Transaction Ordering — Final Exam

The graded final exam for MEV & Transaction Ordering: what MEV is, the mempool and ordering auctions, front-running and back-running, sandwich-attack math, arbitrage and liquidation MEV, and PBS / MEV-Boost / mitigations.

15 min Updated Jun 5, 2026

This is the capstone. Six lessons built the ordering machine from one idea outward — that a block is an ordered list and sequence is worth money; how the public mempool and the priority-fee auction price the right to order you; the two primitive moves, front-running and back-running, and the displacement/insertion/suppression taxonomy they fall into; the exact constant-product math of a sandwich, down to the victim’s lost ETH and the attacker’s profit; the load-bearing side where arbitrage realigns prices and liquidations keep lenders solvent; and the machinery — PBS, MEV-Boost, relays, private orderflow, batch auctions, encrypted mempools, MEV-Share — that tries to minimise, democratise, and redistribute it. No formula sheet, no hints, no take-backs: every answer locks the instant you submit, the wrong options are the exact traps the lessons warned about, and your score stays hidden until the end.

Warning:

How this exam works

This is a graded exam. Questions arrive one at a time. Once you submit an answer it is final — there is no going back, no second try, and a wrong answer simply fails that question. Your score stays hidden until the very end, where you need 70% to pass. Read every option before you commit.

Question 1 of 29

What does the acronym MEV stand for today, and why was it renamed?

Select an answer to continue.

You’ve run the gauntlet. Here is the whole topic as one picture to seal it in.

Big picture

MEV & transaction ordering — the whole topic

  • MEV & ordering
    • What MEV is
      • Profit from include / exclude / reorder
      • Maximal (was Miner) Extractable Value
      • Toxic vs benign — a blurry line
    • Mempool & auction
      • Public, plaintext pending transactions
      • Tip is the lever; base fee burns
      • PGA competes profit up to the proposer
    • Front / back-run
      • Before = front-run; after = back-run
      • Displacement / insertion / suppression
      • Generalized bots simulate and copy
    • Sandwich math
      • 100 ETH / 200k USDC, k = 2e7
      • Victim loses 1.5152 ETH
      • Attacker profit about 3,606 USDC
    • Load-bearing MEV
      • Arbitrage realigns prices
      • Liquidations keep lenders solvent
      • Bonus profit = rate times repaid
    • Taming it
      • PBS keeps validation decentralised
      • Relay = trust bottleneck; ePBS
      • Minimise · Democratise · Redistribute
What MEV is, the mempool auction, the two primitive moves, the sandwich math, the load-bearing side, and the machinery that tames it.

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