Answer:
The correct word for the blank space is: Cost-based contract.
Step-by-step explanation:
Cost-based contracts are those in which the contractor performs a piece of work and, at first, assumes all the costs of the work -and its variations- that are refunded at the end of it adding the additional profits of labor hand. Contractors present evidence of the expenses in the form of invoices so the other party involved in the contract can pay for them. These contracts are signed to incentivize contractors' performance instead of choosing a contractor based on low costs offered.