 Beginning with legal doctrine, we can distinguish rules that seem more concerned with procedural aspects of justice, especially freedom and autonomy in the lead up to agreement, than justice in the final distribution of benefits and burdens. Any number of doctrines—fraud, duress, and undue influence, for example—protect weaker parties from being deceived, coerced, or manipulated into contractual obligations (see  §2.2).  Moreover, the duty of good faith in performance, one of the few mandatory duties that the law imposes on every contract (UCC §1-304; R2: §205), prevents one party from exploiting her counterparty’s strategic vulnerabilities (often incurred on account of the contract itself) to “recapture opportunities forgone at formation” (Burton 1980: 387). This approach to good faith is procedural insofar as it makes the contract—the allocation of opportunities the parties opted into —the measure of what good faith requires.