请教一道notes上关于ethics的题～各位大大 Because, purchase, receives, manager, offering

Andreas42

Because of minimum lot size restriction, a portfolio manager allocates the bonds she receives from an oversubscribed bond offering to her clients in a way that is not strictly proportional to their purchase requests.
为什么这个没有violation of Fair Dealing?
minimum lot size restriction 是什么意思～
求解答～～

ap0258

最小合约尺寸