Question

Consider the fishing optimal control problem defined by
 

\dot{P}_t = aP_t - bP_t x_t,



where P_t is the fish population at time t, and x_t is the fishing intensity or catch (a and b are constants). If r is the discount rate, the objective function is given by
 

V(x) = \int_0^\infty e^{-rt} u(x_t) \, dt,



where the utility of consumption is c_t = x_t.
a) State the transversality condition.

b) Find the optimal consumption x_t, if u(x_t) = \ln(x_t).

11 Jan 2025
Answer :
Word Count : 561

## Optimal Control Problem Analysis for Fishing Resource Management  

Given the problem formulation:

\[
\dot{P}_t = aP_t - bP_t x_t
\]

Where:  
- \( P_t \) is the fish population at time \( t \)  
- \( x_t \) is the fishing intensity or catch rate  
- Constants \( a > 0 \) and \( b > 0 \) represent the natural growth rate of the fish population and the catch efficiency, respectively  

The objective function is:

\[
V(x) = \int_0^\infty e^{-rt} u(x_t) \, dt
\]

with utility function \( u(x_t) = \ln(x_t) \) and consumption \( c_t = x_t \).  

### (a) Transversality Condition  
The transversality condition ensures that the value function \( V(x) \) is finite and the control path is optimal over __________ _______ _________ ______ ___ _____ ___ _____ ________.
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