State the Hand formula and interpret its inequality.4.

Meaning: the market's failure to deliver an efficient (Pareto-efficient — 6.3) allocation on its own — the cases where the invisible hand drops the baton (and the state's intervention acquires its economic warrant). The types and causes (the catalogue — each with the Nepaliinstance):1. Public goods — non-rival (my consumption doesn't reduce yours) and non-excludable (no one can be kept out): national defence, street lighting, the courts and the legal systemitself — the free-rider problem (why pay if you're protected anyway?) means private supply fails: the state's core business.2. Externalities — costs or benefits falling on third parties outside the price: negative (pollution: the factory's private cost below the social cost — the Kali Gandaki's ink? use the general river-pollution case; Kathmandu's air and traffic); positive (vaccination, education — benefits spilling to others and hence under-bought); the cause: missing markets/propertyrights (no one owns the air) — 6.4's Coasean diagnosis.3. Monopoly/market power — ECO-I 3.4's anatomy: price above marginal cost, deadweight loss, entry barriers (the NEA/NOC-type natural and legal monopolies).4. Information asymmetry — one side knows more: adverse selection (before contract — the used-car "lemons" (Akerlof); the insurance market's sickest signing up) and moral hazard (after contract — the insured taking more risk; the bailed-out bank lending looser); Nepal's microfinance over-lending file as the live case.5. Incomplete markets and public choice's…