Then, as to the laws regulating trade and commerce, they were so minute as almost to remind us of the Savior's strictures on Pharisaic meticulousness. Several Mishnic tractates are full of determinations on these points. "The dust of the balances" is a strictly Jewish idea and phrase. So far did the law interfere, as to order that a wholesale dealer must cleanse the measures he used once every month, and a retail dealer twice a week; that all weights were to be washed once a week, and the balances wiped every time they had been used. By way of making assurance doubly sure, the seller had to give rather more than an ounce in addition to every ten pounds, if the article consisted of fluids, or half that if of solids (Baba B. v. 10, 11). Here are some of the principal ordinances relating to trade. A bargain was not considered closed until both parties had taken possession of their respective properties. But after one of them had received the money, it was deemed dishonorable and sinful for the other to draw back. In case of overcharge, or a larger than the lawful profit, a purchaser had the right of returning the article, or claiming the balance in money, provided he applied for it after an interval not longer than was needful for showing the goods to another merchant or to a relative. Similarly, the seller was also protected. Money-changers were allowed to charge a fixed discount for light money, or to return it within a certain period, if below the weight at which they had taken it. A merchant might not be pressed to name the lowest price, unless the questioner seriously intended to purchase; nor might he be even reminded of a former overcharge to induce him to lower his prices. Goods of different qualities might not be mixed, even though the articles added were of superior value. For the protection of the public, agriculturists were forbidden to sell in Palestine wine diluted with water, unless in places where such was the known usage. Indeed, one of the Rabbis went so far as to blame merchants who gave little presents to children by way of attracting the custom of their parents. It is difficult to imagine what they would have said to the modern practice of giving discount to servants. All agreed in reprobating as deceit every attempt to give a better appearance to an article exposed for sale. Purchases of corn could not be concluded till the general market-price had been fixed.

But beyond all this, every kind of speculation was regarded as akin to usury. With the delicacy characteristic of Rabbinical law, creditors were expressly prohibited from using anything belonging to a debtor without paying for it, from sending him on an errand, or even accepting a present from one who had solicited an advance. So meticulous were the Rabbis in avoiding the appearance of usury, that a woman who borrowed a loaf from her neighbor was told to fix its value at the time, lest a sudden rise in flour should make the loaf returned worth more than that borrowed! If a house or a field were rented, a somewhat higher charge might be made, if the money were not paid in advance, but not in the case of a purchase. It was regarded as an improper kind of speculation to promise a merchant one-half of the profit on the sales he effected, or to advance him money and then allow him one-half of the profits on his transactions. In either case, it was thought, a merchant would be exposed to more temptation. By law he was only entitled to a commission and to compensation for his time and trouble.