Generalized Ozaki cost function

The generalized-Ozaki cost is a general description of cost described by Shuichi Nakamura.

For output y, at date t and a vector of m input prices p, the generalized-ozaki cost, c, is

$c(p,y,t)=\sum _{i}b_{ii}\left(y^{b_{yi}}e^{b_{ti}t}p_{i}+\sum _{j\,:\,j\neq i}b_{ij}{\sqrt {p_{i}p_{j}}}y^{b_{y}}e^{b_{t}t}\right).$