Answer:
Quantitative perspective.
Step-by-step explanation:
Roger is using capital asset pricing model and other mathematical tools to track his clients finances. Quantitative perspective involves the use of analysis, statistics, modelling, and computer simulations the help in decision-making.
The aim of quantitative perspective is to solve complex problems and give valuable insights from large amount of data.
For example analysing to see what time of year has lowest business activity, or products with highest revenue and so on.