5. _Insurance is, in outer form, a bet; but its essential purpose is the useful one of equalizing and eliminating chance._ In its early form insurance was a bet made by a ship-owner to protect his cargo from loss. The chance of loss in shipping was even greater in the Middle Ages than now, and it became customary for the ship-owner to bet with a wealthy man that the ship would not return. If it did come back, the owner could afford to pay the bet; if it did not, he won his bet and thus recovered a part of his loss. It was what is called to-day "a hedge," that is, one bet made to neutralize, or offset, another. This gave to the smaller merchant the advantage of distributing his losses over a number of voyages, as was done by the owner of many vessels. Antonio, the wealthy merchant, is made thus to express his security: "My ventures are not in one bottom trusted Nor to one place; nor is my whole estate Upon the fortune of this present year. Therefore my merchandise makes me not sad." Gradually there came about a specialization of risk-taking by the men most able to bear it. They could tell by experience about what was the degree of uncertainty, and could lay their wagers accordingly. When several insurers were in the same business, competition forced them to insure the vessel and cargo of the ordinary trader for something near the percentage of risk involved. The insurance thus tended to become a mutual protection to the ship-owners; what had to be paid in premiums to cover risk came to be counted as part of the cost of carrying on that business. [Sidenote: Insurance as mutual protection] Modern insurance is mutual in nearly every case: the total premiums equal the total losses plus operating expenses, the interest on the reserve of premiums counting as part of the premium. Each one gets protection for the loss of his property in return for the payment of a sum that will cover the losses on others' property. Such an exchange is a profitable one. The premium comes from marginal income; the loss of house or property would fall upon the parts of income having higher marginal utility. The less urgent wants of the present are sacrificed in order to protect the income that gratifies the more urgent wants of the future. In insurance each party gives a smaller utility for a greater; each has a margin of advantage; while the greater certainty in business stimulates effort and rewards it. This is quite the opposite of the working of betting and gambling. [Sidenote: Conditions of sound insurance]