Answer:
Positive Externality
Step-by-step explanation:
Externalities are extra side effects to third un-involved party, without any monetary transaction for the same
Positive Externality is the positive side effect to third un-involved party, without any monetary transaction for the same. Negative Externality is negative side effect to third un-involved party, without any monetary transaction for the same.
The Local bride shop has only paid for the road signage facelift. Despite, all the seven other shops sharing strip mall with it also use the sign. This act of local bride shop will have more visibility & other benefits for all the other 7 businesses linked to it, who have not although paid for it. So, the other 7 businesses have a positive extra effect due to local bride shops' act. Hence it is a positive externality for all of them.