Two insurance companies I 1 . I 2 with reserves R 1 ( t ) . R 2 ( t ) compete for customers. such that in a suitable differential game the smaller company I 2 with R 2 ( 0 ) < R 1 ( 0 ) aims at minimizing R 1 ( t ) − R 2 ( t ) by using the premium p 2 as control and the larger I 1 at maximizing by using p 1 . https://www.marketingjeunesse.com/product-category/reconstructor-for-chemically-treated-hair/