This traditional system of trading has been largely overtaken by more efficient technologies, first by telephonic and then electronic trading systems. The New York Stock Exchange  still conducts a small proportion of trades (although typically high-value) through floor traders.
Assessment of systemic risks necessitated development of diagnostic tools that simultaneously trace the changes in macro-financial conditions which pose risks to financial stability, identify “point in time” risk conditions, while also assessing the potential future impact of all these risk factors, jointly, on systemic stability.