banking without usury is a very important object that has been considered by experts and investigated all time. in this writing, we have explored banking debt with known profit and concluded its rightness, based on soling debt right. in this way after lending money the bank sales it to debtor with agreed price. the way is similar about person's lending to bank and thus there is no usury. i...

In this work, we study an equilibrium-based continuous asset pricing problem which seeks to form a price process endogenously by requiring it balance the flow of sale-and-purchase orders in exchange market, where large number agents $1\leq i\leq N$ are interacting through market price. Adopting mean field game approach, find special forward-backward stochastic differential equations McKean--Vla...

With the continuous development of social economy, "take-out fast food" industry has come into being and gradually comes public's view. This paper mainly analyzes impact from a sociological perspective, i.e., positive negative impacts, puts forward some constructive opinions measures on how to make more environmentally friendly healthy, which can help; In this regard, it is necessary further st...