Compulsory cartels are a forcing of all producers in an industry into one organization, or virtual organization. Instead of being directly barred from an industry, firms are forced to obey governmentally imposed quotas of maximum output. Such cartels invariably go hand in hand with a governmentally imposed program of minimum price control. When the government comes to realize that minimum price control by itself will lead to unsold surpluses and distress in the industry, it imposes quota restrictions on the output of producers.

Instead of making the product prohibition absolute, the government may prohibit production and sale except by a certain firm or firms. These firms are then specially privileged by the government to engage in a line of production, and therefore this type of prohibition is a grant of special privilege. If the grant is to one person or firm, it is a monopoly grant; if to several persons or firms, it is a quasi-monopoly or oligopoly grant. Both types of grant may be called monopolistic.

Another form of triangular intervention is interference with the nature of production directly, rather than with the terms of exchange. This occurs when the government prohibits any production or sale of a certain product. The consequence is injury to all parties concerned: to the consumers, who lose utility because they cannot purchase the product and satisfy their most urgent wants; and to the producers, who are prevented from earning a higher remuneration in this field and must therefore be content with lower earnings elsewhere.

A TRIANGULAR INTERVENTION, AS WE have stated, occurs when the invader compels a pair of people to make an exchange or prohibits them from doing so. Thus, the intervener can prohibit the sale of a certain product or can prohibit a sale above or below a certain price. We can therefore divide triangular intervention into two types: price control, which deals with the terms of an exchange, and product control, which deals with the nature of the product or of the producer.

The intervener may set either a minimum price below which a product cannot be sold, or a maximum price above which it cannot be sold. He can also compel a sale at a certain fixed price. In any event, the price control will either be ineffective or effective. It will be ineffective if the regulation has no current influence on the market price. Thus, suppose that automobiles are all selling at about 100 gold ounces on the market. The government issues a decree prohibiting all sales of autos below 20 gold ounces, on pain of violence inflicted on all violators.

WE HAVE SO FAR CONTEMPLATED a free society and a free market, where any needed defense against violent invasion of person and property is supplied, not by the State, but by freely competitive, marketable defense agencies. Our major task in this volume is to analyze the effects of various types of violent intervention in society and, especially, in the market. Most of our examples will deal with the State, since the State is uniquely the agency engaged in regularized violence on a large scale. However, our analysis applies to the extent that any individual or group commits violent invasion.