TY - JOUR
AU - Kachapova, Farida
AU - Kachapov, Ilias
PY - 2012
TI - Finding the Envelope and Efficient Frontier of Financial Assets
JF - Journal of Mathematics and Statistics
VL - 8
IS - 3
DO - 10.3844/jmssp.2012.323.329
UR - https://thescipub.com/abstract/jmssp.2012.323.329
AB - Problem statement: One of the problems considered in financial mathematics is finding portfolios of given financial assets that minimize risk for targeted returns. The set of such portfolios is called the envelope of the assets. Traditionally this problem is solved as a calculus minimization problem involving partial derivatives and Lagrange multipliers. Approach: In this study we describe an invariant geometric solution that uses orthogonal projection in Euclidean space of random variables. Results: The method is applied to find the efficient portfolio and feasible region of the assets and to investigate the mean-variance relation for envelope portfolios. In particular, it is shown that the graph of this relation is the right branch of a hyperbola. The method is illustrated by an example with four financial assets. Conclusion/Recommendation: The described geometric approach can help to improve the teaching of portfolio analysis by making the concept of envelope clearer and by simplifying proofs.