The best method in my opinion would be to allow clients to buy only based on the cash balance that is available with them(no exposures at all) that may in the initial stages be a dampner by way of low volumes but in the ultimate analysis this wil help both the clients and the brokerage houses...Clients will be benifitted by being able to hold on to the stock as long as they are not getting their price(each client has a target price as per his/her risk profile)without inflating the cost as there is no margin funding and therefore no RMS selling in times of market blip. From the broker's side the benifit will be that there will be no additional pressure for RMS and it will be a simple method of carrying out investors instructions of buying and selling
