Classification of illegal agreements.................................... 1628

Variation of public policy........................................... 1629

Effect of illegal agreements.......................................... 1630

When illegality must be pleaded.....................................1630a

Illustrations of recovery by innocent plaintiffs......................... 1631

Illustrations of recovery where plaintiff not innocent.................... 1632

Contracts in restraint of trade....................................... 1633

Early law......................................................... 1634

Reasons for holding restraint invalid................................. 1635

Reasonableness of restraint.......................................... 1636

Statement by Taft, J., of permissible restraints........................ 1637

Partial restraints are valid; limit of time.............................. 1638

Limits of space.................................................... 1639

Contract implied on sale of good will................................. 1640

Sale of business with restrictive covenant is valid...................... 1641

Sale or lease of property with restrictive covenant..................... 1642

Promises ancillary to contracts of employment......................... 1643

Partners may make restrictive promises............................... 1644

Agreements for exclusive dealing..................................... 1645

Contracts not to divulge trade secrets are valid......................... 1646

Patented and copyrighted articles.................................... 1647

Agreement among competitors to limit competition or maintain prices.... 1648

Limitations on resale prices.......................................... 1649

Recovery of agreed payment for performing restrictive promise.......... 1650

Public service corporations.......................................... 1651

Agreements unduly restricting personal liberty are invalid............... 1652

Any contract may be rendered invalid if tending to produce monopoly... . 1653

Trade union agreements: English law.................................. 1654

Trade union agreements: American law................................ 1655

Effect of trade union being in restraint of trade........................ 1656

Anti-Trust Acts: Sherman Act....................................... 1657

Construction of the Sherman Act..................................... 1658

Divisibility of promises imposing excessive restraint.................... 1659

Partial enforcement of promise indivisible in terms..................... 1660

Collateral effects of illegal combinations.............................. 1661

Trust laws in foreign countries...................................... 1662

Contracts not to bid at auction....................................... 1663

Puffing............................................................ 1664