Whether the purchaser or the merchant is happier with a sale: Nedarim 31a-b
A woman who sells the rights to her ketubah is only doing it because the need for immediate money compelled her, like someone struck 100 times with a small iron weight attached to a strap: Ketuvot 53a
One always expects to use anything that might be useful to him; one would not designate something as "for the animals" if he thought he might be able to use it personally: Beitzah 6b
A Person wouldn't work hard and then destroy his work: Yevamot 107a, Ketuvot 10a
People are happier with an item which they produced personally, than with an item which someone else produced which is more valuable: Bava Metzia 38a
A person wouldn't put his life in danger for his property: Shabbat 153a, 153b
Men are more commercially interested than women: Pesachim 43a; Succah 28a; Kiddushin 35a; Bava Kama 15a
People prefer an item of lesser value now, to an item of greater value later: Succah 56b
A lender will check out the validity of his Witnesses: Ketuvot 18b
Whether people usually pay on the actual date a debt is due, or not: Bava Metzia 17a
Whether people will rent a house for 30 days / less than a season: Rosh HaShanah 7b
People don't mind allowing someone else to travel via their property [where it isn't harmful]: Megillah 8a
People are concerned for their property, and if we prohibit a technically permissible action this may lead them to transgress: Shabbat 117b (2x), 120b; Pesachim 11a-b
Whether the Above can be said regarding concern for the Pain felt by his Property: Pesachim 11b
People notice the loss of a valuable or heavy object from their person quickly, as they check regularly: Bava Metzia 21b [4x]
People don't lend out their wallet, seal or purse: Bava Metzia 27b
Whether non-Jews are uncomfortable about renting property to Jews, due to concern that the Jews are practicing some form of sorcery: Eruvin 62a
You can gauge a person's true nature by the way he spends money, the way he handles anger, the way he acts when drunk, and some add by what makes him laugh: Eruvin 65b
Do people who purchase coins want them as valuable metal, or as minted metal: Bava Metzia 45b
People are willing to overpay for clothing, and balance it by spending less on food: Bava Metzia 52a
It is considered stingy to refuse coins which are inferior, so long as they are acceptable as currency: Bava Metzia 52b
We believe a witness whose financial investment demonstrates that he believed his words were true; people don't spend their money for nothing: Ketuvot 36b
It may be assumed that somone who is selling an animal will not give it to the buyer prior to being paid: Ketuvot 76b
Partnerships
A pot owned by partners is never hot or cold: Eruvin 3a