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| Variables | Meaning |
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| A numbers | Number of class A contractors |
| B numbers | Number of class B contractors |
| C numbers | Number of class C contractors |
| Upgrading of B | Number of class B upgrading to class A, annually |
| Upgrading of C | Number of class C upgrading to class B, annually |
| Degrading of A | Number of class A degrading to class B, annually |
| Degrading of B | Number of class B degrading to class C, annually |
| Capi. develop. Time 1 | Time needed for class C to upgrade to class B, in terms of capital development |
| Capi. develop. Time 2 | Time needed for class B to upgrade to class A, in terms of capital development |
| B threshold | Contract amount required for class C to upgrade to class B |
| A threshold | Contract amount required for class B to upgrade to class A |
| A market share power | Market share power of class A contractors |
| B market share power | Market share power of class B contractors |
| C market share power | Market share power of class C contractors |
| Ave. employees of A | Average number of employees of class A contractors |
| Ave. employees of B | Average number of employees of class B contractors |
| Ave. employees of C | Average number of employees of class C contractors |
| Capital amount level of A | Average capital of class A contractors |
| Capital amount level of B | Average capital of class B contractors |
| Capital amount level of C | Average capital of class C contractors |
| Ave. revenue of A | Average revenue of class A contractors, per year |
| Ave. revenue of B | Average revenue of class B contractors, per year |
| Ave. revenue of C | Average revenue of class C contractors, per year |
| A market size | Market size, above 75 million |
| B market size | Market size, between 25~75 million |
| C market size | Market size, under 25 million |
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