The Project Valuation with Abandonment and Reset Investment Proportion Applying Real Option Method

We discuss the valuation of investment project in a firm applying a real option method with abandonment and reset investment proportion. We take the depreciation value of the facilities and the research and development (R & D) fee into consideration. Our contribution is to derive a pricing model of two-stage optimal decisions allowing abandonment and reset investment proposition. Different from the net present value (NPV) or discount cash flow (DCF), the real option method can efficiently catch the uncertainty in the market, and it can help managers to make the optimal policy for the project. We can improve our method for a multi-stage decision model or a continuous decision model in the further researches.


Introduction
We discuss the valuation of investment project in a firm applying a real option model with abandonment and reset investment proportion.We take the depreciation value of the facilities and the research and development (R & D) fee into consideration.Because of the uncertainty of the real world, the policy-making of a firm should be dynamic.We focus on deriving a pricing model of two-stage optimal decisions allowing abandonment and reset investment proposition in this study.
The traditional method to evaluate a project is through the net present value (NPV) or discount cash flow (DCF).If the net present value of the project is positive after considering the future cash flow of each period, we would accept the project.Otherwise we will decline it.Robichek and Horne [1] first suggested that if the residual value of a project was greater than the present value of the operating cash flow, the managers would cease the project.However, Dyl and Long [2] reported that allowing abandonment of a project would delay to exercise the abandonment options because of different residual values of the project or policy-making points.Therefore, the strategy of Robichek and Horne [1] may not be optimal for the project at the decision point.Hayes and Garvin [3] proposed that using NPV to evaluate a project would undervalue or miss the opportunity value of the investments, so the managers could not make the optimal policy to the project immediately during a short time when the transient investment opportunity appeared.The scope of a project would expand or shrink according to each situation in the real world.Nevertheless, NPV and DCF can't catch the expected uncertainty in the market, and they are hard to evaluate the approximate value of the project in a firm.The advantage of our model is that we can extend or reduce the investment proportion of a project according to situations in the market with time.
Because of the maturation of appropriate valuation models in barrier options and reset options recently, we could apply the concepts of barrier options and reset options to evaluate a project and derive the valuation of two-stage decision model, which can extend or reduce the scope of a project in the policy-making point.We could further study which models are more compatible with the real world-multi-stage decisions models or continuous decisions models.
The rest of this paper is organized as follows.Section 2 is the literature review.Section 3 is the methodology about considering only abandonment, or both abandonment and reset investment proportion.Finally, Section 4 discusses the conclusions and recommendations of further researches.

Literature Review
Robichek and Horne [1] first suggested that if the residual value of a project is greater than the present value of the operating cash flow, the managers will cease the project.However, Dyl and Long [2] reported that allowing abandonment of a project in different residual values or time points would delay to exercise abandonment options.Hayes and Garvin [3] proposed that using NPV to evaluate a project would undervalue or miss the opportunity value of the investments, so the managers cannot make an optimal policy to the project immediately during a short time when the transient investment opportunity appears.
Since Gray and Whaley [4] and Boyle and Lau [5] developed the valuations of reset put options and barrier options respectively, merchandise bound up with those are very famous in the financial market as hedging or speculating instruments.Cheng and Zhang [6] proposed closed form solutions of the discrete multi-stage reset option represented as a multiple variables normal distribution.Boyle, Kolkiewicz and Tan [7] used Monte Carlo Simulation to price reset options.Kimura and Shinohara [8] discovered that convertible bonds generally have reset conditions additionally.Furthermore, Ritchken [9] used a stretch parameter and trinormal lattice model to increase the probability of barrier level near the nodes.Broadie, Glassman and Kou [10] and Hörfelt [11] derived the formula of discrete single barrier option.Ahn, Figlewski and Gao [12] used an adaptive mesh model to price discrete barrier option.Hence, the valuations of reset options and barrier options are very mature and popular.
We focus on applying the concepts of reset options and barrier options to the valuation of a project in a firm.We derive the valuation of two-stage decision model, and we put more emphasis on the research and development (R & D) fee into consideration.We could derive a general valuation model in the future researches.

Methodology
This paper discusses the two-stage decisions of a project in a firm using the valuation of real options with abandonment and reset conditions.The valuation is a series of initial value problems because of discrete policymakings in multi-stage time.According to different criterions at different policy-making points, it is a series of free boundary problems.Therefore, the valuation of the decision problem can be viewed as a series of combinations of initial value problems and free boundary value problems.We adapt an approach to solve a partial differential equation (PDE)-Green's function, which is useful to solve the initial value problem and boundary value problem, to discuss the valuation of a project in a firm.

Basic Assumption
We adapt the fundamental assumptions in Kulatilaka and Perotti [13] as following two points.
where Q is the total supply in the market, and the random variable θ satisfies the geometric Brown motion with expected return µ and volatility σ .
2) If no initial investment is made, the firm will produce only when the market is profitable with a unit cost of ν .The function of production benefit of the firm can be defined as in the market, the maximum benefit of production is Next, we define A to be a part of the project asset which can be sold in the market, such as the real estate, facilities or factory buildings.Suppose the average depreciation rate of facilities is ρ .The firm can decide to cease the project in the maturity date T and sell the asset A to the market with the depreciation value, e T A ρ − ⋅ .In addition, the part of asset which cannot be sold is N, such as salary, research and development (R & D) fee.
Suppose the natural growth rate of the research and development (R & D) fee is ϕ , then the fee at the maturity date T is e T N ϕ ⋅ .Furthermore, we suppose that the products have a maximum demand in the real market, and the facilities of the project have finite ability to produce the products.We consider the present maximum balance benefit is H, and it increases with time by the natural growth rate η .The maximum balance benefit at the maturity date T will be e T H η ⋅ .

The Payoff of Real Option with Abandonment at Maturity T
When the maximum benefit of production ( ) where ** T θ satisfies Equation (1).
In addition, other firms would buy the old facilities of the project only if the benefit is greater than the cost they pay.On the contrary, if the benefit which the facilities would create is lesser than the cost of the facilities, there will be no firm buying the facilities.The project will be worthless.Therefore, the balance point will satisfy the following equation: where ** T θ and * T θ satisfy Equations ( 1) and (3), respectively.
When we continue to produce the products, we can obtain more benefit.However, there is a maximum balance benefit at each policy-making point after considering the demand of population and the ability of the facilities.It means that the benefit is finite.Therefore, the threshold *** T θ satisfies the following equation.( ) where ** T θ and *** T θ satisfy Equations ( 1) and ( 5), respectively.From above explanation, the benefit function for all situations at the maturity date T is as follows: ( )

Two-Stage Decisions with Abandonment at Pre-Dependent Time t 1 and Maturity T
According to assumptions in Subsection 3.1, the valuation of the project is transformed as a contingent claim that depends on the underlying random valuable θ .The valuation of the contingent claim is modeled by a par- tial differential equation (PDE) with initial and boundary conditions.Solving this problem means that we find the value of the project with the contingent claim.
The underlying θ satisfies the geometric Brown motion with expected return µ and volatility σ , which means the distribution of θ follows a lognormal distribution.Let ( ) , then the benefit function π , a function of θ and t, can be viewed as a function of y and t.The function ( ) satisfies the PDE as Equation (8).
Then, Equation ( 8) can be transformed to the Heat Equation ( 9) by the variable transformation (10).
Therefore, the maturity date T will become 0 τ = , the policy-making point t 1 will be 1  We adapt the most useful method-Green's function to solve the heat Equation ( 9).The translated valuation ( ) , u x τ will be the convolution of initial condition ( ) 0 ,0 u x and Green's function as follows: ( ) ( ) ( ) where Green's function .
( ) ( ) Therefore, we can graph Equation ( 13), the translated valuation of the project in each interval and each criterion of the threshold, as Figure 1.
After using the integral representation with Green's function, the present translated valuation of the project can be presented as follows: Finally, we can obtain the present valuation of the project as Equation ( 18).x τ τ = satisfy Equations ( 14)-( 16), respectively.

Two-Stage Decisions with Abandonment and Reset Investment Proportion at Pre-Dependent Time t 1 and Maturity T
The demand is changing with time in the real world, so the investment of the project should adjust accordingly to cope with the situation in the market.For example, when the forecasted demand increases, we add the investment proportion of the project at the policy-making point.Then we set the increasing proportion for the demand of population to be % H β , and we increase the investment % A β in the facility.On the other hand, if the forecasted demand decreases, we reduce the investment proportion of the project.We set the decreasing proportion for the demand of population to be % H α , and we decrease the investment % A α in the facility.We make the appropriate policy to adjust the quantity of the investment of the project.
The policy-making depends on the situation of the transformed random variable x at time 1 τ .If 1 x is lesser than the criterion 1 d x τ τ = , we will decide to reduce the investment proportion in the project.The initial condition of PDE after reducing investment in the project is as follows: The translated valuation of the project after reducing investment at the policy-making point is as equation (20).

(
) ( ) ( ) The criterion 1 d x τ τ = depends on the following equation: ( ) ( ) , , That is, ( On the contrary, when 1 x is greater than the criterion 1 u x τ τ = , we will decide to add the investment proportion in the project.The initial condition of PDE after adding investment in the project is as follows: The translated valuation of the project after adding investment at the policy-making point is as Equation ( 23).
( ) ( ) ( ) The criterion 1 u x τ τ = depends on the following equation: ( ) ( ) That is, ( ) ( ) ( ) ( ) That is, when random variable 1 x is lesser than the criterion 1 d x τ τ = , the valuation of the project after reducing investment at the policy-making point is as Equation (20).When random variable 1 x is greater than the criterion 1 u x τ τ = , the valuation of the project after adding investment at the policy-making point is as Equation (23).Otherwise, when the random variable 1 x is between x τ τ = , we will maintain the original proportion in the project.
Furthermore, when the operating benefit of the project is too bad after reducing the investment of the project at the policy-making point, we will even consider to close the project and to sell the facilities to the market with its depreciation value.Hence, the criterion of the threshold 1 ** x τ satisfies the following Equation (25).If the op- erating benefit of the project is extremely troublesome, the valuation of the project could be worthless, and the critical value On the other hand, if the operating benefit of the project is very good after adding investment, even over the upper bound of production of the factory, the critical value Comparing with Equation ( 13), we can rearrange above equations as Equation (28). Figure 2 illustrates the translated valuation of the project in all situations between each critical value.For example, when the random variable is lesser than x τ τ = , we will decide to cease the project and sell the facilities to the market with the depreciation value.Moreover, when the production index is lesser than   12), ( 20) and (23), respectively.
to pay the increasing research and development (R & D) fee e T N ϕ ⋅ , we can obtain the benefit by continuing the project.We decide to hold the project and keep producing.On the contrary, if the benthe increasing research and development (R & D) fee e T N ϕ ⋅ both, we will decide to abandon the project and sell the facilities at the maturity date T with the price of e T A ρ − ⋅.Hence, we can represent the balance point as follows: the benefit function at the maturity is the benefit function is as Equation (6).

1 T
t τ = − , and the present time t 0 will be 0 0 T t τ = − .The terminal payoff at the maturity is the initial condition of Equation (9) at the time interval [ ] 1 0,τ , and the translated payoff ( )

Figure 1 .τ
Figure 1.The translated valuation of real option with abandonment between each criterion of the threshold at predetermined policy-making point 1 τ .Note:

(
will decide to reduce investment.When it is still lesser than 1 **

1 *
x τ τ = , the valuation of the project is worthless.As the situation of production index decide to adapt the original investment level.When the production index is greater than 1 u x τ τ = , we decide to increase the investment in the project.Moreover, the production index is greatwould obtain the maximum benefit in our project at the policy-making time 1

Figure 2 .τ=
Figure 2. The translated valuation of real option with abandonment and reset investment proportion between each criterion of the threshold at predetermined policy-making point 1 τ .Note: