_Answ._ To the first case: you must distinguish between an act of justice and of charity; and between your need of the thing and the worth of it to you. Though you have no need of the poor man's goods, yet if you buy them, both justice and charity require that you give him as much as they are worth to you, though not so much as they are worth in the market: yea, and that you buy them of him in his necessity; for if you give him but what they are worth to you, you are no loser by it; and you should do another good, when it is not to your own hurt or loss. By what they are worth to you, I mean so much as that you be no loser. As, if it be meat or drink, though you have no present need, perhaps you will shortly have need, and if you buy not that, you must buy as much of somewhat else. In strict justice you may be a saver, but not a gainer, by buying of the poor in their necessity. 2. But if you buy a durable commodity for less than it is worth, you should take it but as a pledge, and allow the seller liberty to redeem it if he can, that he may get more after of another. 3. And to the poor in such necessity, charity must be exercised as well as justice. Therefore if you are able to lend them money to save them the loss of underselling, you should do it. (I account that man only able who hath money which no greater service of God requireth.) And if you are not able yourself, you should endeavour to get some others to relieve him, if you can without a greater inconvenience.
And for the second case, it is answered before: you may not take more than it is worth, ever the more for another's necessity; nor in any other case than you might have done it in, if there had been no such necessity of his.
_Quest._ XII. May I not make advantage of another's ignorance or error in bargaining?
_Answ._ Not to get more than your commodity is worth, nor to get his goods for less than the worth; no, nor to get the true worth against his will, or with scandal: but if it be only to get a true worth of your own commodity when he is willing, but would be offended if his ignorance in some point were cured, you may so far make use of his ignorance to a lawful end, as is said before in the case of concealing faults.
_Quest._ XIII. May I strive to get before another, to get a good bargain which he desireth?
_Answ._ Yes, if you do it not out of a greedy mind, nor to the injury of one that is poorer than yourself: you should rather further the supply of your neighbour's greater needs; otherwise speed and industry in your calling is no fault, nor yet the crossing of a covetous man's desires: you are not bound to let every man have what he would have.
_Quest._ XIV. May I buy a thing out of another's hand, or hire a servant which another is about or is treating with? Or may I call a chapman from another to buy of me?
_Answ._ There are some cases in which you may not do it, and some in which you may. You may not do it out of a greedy covetousness; nor to the injury of the poor: nor when the other hath gone so far in the bargain that it cannot be honestly broken; for then you injure the third person, and tempt the other to a sin: nor may you do it so as to disturb the due and civil order, which should be among moderate men in trading. And it is a great matter how the thing is accounted of by the custom of the country or market where you bargain; for where it is of ill report, and accounted as unjust, the scandal should make you avoid such a course. But yet in some cases it is lawful, and in some a needful duty. It is lawful when none of the foresaid reasons (or any such other) are against it: it is a duty when charity to the poor or oppressed doth require it. As e. g. a poor man must needs sell his land, his horse, his corn, or goods: a covetous oppressor offereth him less than it is worth. The poor man must take his offer if he can get no more: the oppressor saith that it is injustice for any one to take his bargain out of his hand, or offer money till he have done: in this case it may be a duty, to offer the poor man the worth of his commodity, and save him from the oppressor. A covetous man offereth a servant or labourer less than their service or labour is worth; and will accuse you, if you interrupt his bargain and would offer his servant more: in this case it may be your duty to help the servant to a better master. A chapman is ready to be cheated by an unconscionable tradesman, to give much more for a commodity than its worth: charity may oblige you in such a case to offer it him cheaper. In a word, if you do it for your own gain, in a greedy manner, it is a sin; but if you do it when it is not scandalous or injurious, or do it in charity for another's good, it is lawful, and sometimes a duty.
_Quest._ XV. May I dispraise another's commodity to draw the buyer to my own?