Local Risk Minimization Under Time-Varying Transaction Costs
Abstract
Closely following the results of Lamberton, Pham, and Schweizer [5] we construct
a locally risk-minimizing strategy in a general incomplete market including transactiou
costs. This is done in dbcrete time under the assurnptious of a bounded meanvariance
tracleoff and substantial risk. Once we establbh all the required integrability
conditions, a backward induction argument is implemented to obtain the desired
strategy for every square-integrable contingent claim. \Ve model the trnusactiou costs
as an adapted stochastic process aud provide all necessary proofs in detail.