function createManager(fuEx, spEx, symbolPairs, cmdHedgeAmount, fuMarginLevel, fuMarginReservedRatio) {
    var self = {}
    self.fuEx = fuEx
    self.spEx = spEx
    self.symbolPairs = symbolPairs
    self.pairs = []                        
    self.fuExTickers = null                
    self.spExTickers = null                
    self.tickerUpdateTS = 0                
    self.fuMarginLevel = fuMarginLevel     
    self.fuMarginReservedRatio = fuMarginReservedRatio 
    self.cmdHedgeAmount = cmdHedgeAmount