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This note discusses a variety of methods to assist intuition in complex situations with multiple objectives and a potentially large set of alternatives. It begins with heuristic rules, which are relatively simple ways to sort out alternatives without thinking too much about trade-offs. After discussing the reliability of such rules, it moves to multicriteria analysis, which is a more rational method of balancing conflicting objectives.

In the 1920s, Germany experienced one of the most severe episodes of hyperinflation in history. The episode originated in military defeat and revolution, produced instability that figured prominently in the onset of the Great Depression, and created policy dilemmas that present cautionary lessons for leaders in business and government. This note examines the causes, dynamics, and consequences of Germany's hyperinflation in 1923. Hyperinflation is an episode of very large price increases across a broad range of goods and services that often arises from excessive expansion of the supply of paper money to finance government expenditures. It causes wasteful distortions in the functioning of markets, including hoarding of goods and commodities, currency depreciation, capital flight, price controls, and black markets. In a self-reinforcing cycle, price increases beget greater issuance of currency, which begets more price increases and so on, until a political regime shift reforms the unit of currency and government spending.

With frequent water main breaks, leaking pipes, and lead contamination, the water infrastructure of many countries is in bad shape, and improvements are urgent in light of climate change and increasing water stress. Discussion in recent years has focused on the role of private companies in a sector that has traditionally been in public hands. Since the privatization of the United Kingdom's water infrastructure in the late 1980s, a whole range of novel modes of cooperation have been identified, from 100% private to 100% public ownership. This note focuses on the economics of public-private partnerships (PPPs). PPPs offer a contractual approach to the delivery of infrastructure goods and services that are typically provided by the public sector or by heavily regulated private operators such as public utilities. They tend to involve relatively long-term contracts, in which the public sector shares some decision-making authority and property rights with private companies. This overlap of ownership and decision-making powers between the public authorities and private operators is both the appeal and the challenge of water PPPs.

Hoshin kanri (HK), or strategy deployment, has been an integral part of the company management practices of some of the most successful Lean-practicing organizations. The purpose of this note is to give a very quick introduction to how it has been successfully used in small and medium-sized value streams to inject strategic meaning and tactical understanding to operational strategies and improvement plans. Done well, HK is an extraordinary tool to help a team develop, adjust, and communicate strategy to meet robust, long-term goals.

This note explains the workings of money and cryptocurrencies and introduces what money is, before briefly reviewing its history. The note elaborates on the workings of money today (i.e., fiat currencies such as the US dollar and the European euro) and the importance of debt in the financial system. It then explains what cryptocurrencies consist of, notably the workings of blockchain technologies and the goals that utopian currencies hope to achieve. The note concludes by describing three major cryptocurrencies: bitcoin, Äž1, and impak Coin.

This note explains the workings of money and cryptocurrencies and introduces what money is, before briefly reviewing its history. The note elaborates on the workings of money today (i.e., fiat currencies such as the US dollar and the European euro) and the importance of debt in the financial system. It then explains what cryptocurrencies consist of, notably the workings of blockchain technologies and the goals that utopian currencies hope to achieve. The note concludes by describing three major cryptocurrencies: bitcoin, Ğ1, and impak Coin.