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