Final answer:
The constraint x31 + x32 + x33 + x34 ≤ 2 in an assignment problem limits the sum of these variables, representing assignments or decisions, to a maximum of 2.
Step-by-step explanation:
The assignment problem constraint x31 + x32 + x33 + x34 ≤ 2 typically represents a restriction in an optimization problem, such as in operations research or linear programming. In this context, it would mean that the variables x31, x32, x33, and x34 represent particular assignments or decisions and their sum cannot exceed 2.
This implies that at most two of these assignments or decisions can be chosen if each variable is binary (taking on a value of 1 if the assignment is made and 0 if not). If the variables are non-binary, the sum of their values must still be less than or equal to 2, reflecting the maximum allowable combined level for these decisions.