Parameter	Sign of derivative of $\frac{\partial}{\partial t} N (t, x)$ w.r.t parameter	Sign of derivative of $\frac{\partial}{\partial} r_{i} (t, x)$ w.r.t parameter
k	Positive	NA
$m_{f}$	Negative	NA
$β$	Negative	Positive
l	Positive if $k_{1} - m_{f} < 0$ Negative if $k_{1} - m_{f} > 0$	Negative
$λ_{i}$	Positive	Negative
$α$	Negative	Positive
$γ$	Negative	Positive