Consider input-output model: input matrix: a= r 0.05 0.33 0.19 0.25 0.10 0.38 0.34 1 0.12 0 final-demand vector: d= r 1800 200 900 1) explain economic meaning of the elements 0.25, 0, and 900. (3 points) 2) explain the economic meaning of the second-column sum. (3 points) 3) write out the specific input-output matrix equation for this model. (2 points) 4) solve the model by any method. (8 points) 5) describe in words what your solution mean. (4 points) 6) write out comparative-static derivatives in the form of 7.23" on page 174 in the textbook. (2 points) 7) what does the partial derivative of xı with respect to d2 mean? (2 points)

Read the overview below and complete the activities that follow.apartment complexes often look for ways to recruit new tenants and retain current tenants. although apartment complexes offer the tangible benefit of shelter to their tenants, many apartment complexes also offer additional services to tenants to encourage tenants to stay or to support the rent prices. the following scenario identifies the several service gaps of a company that runs an apartment complex as well as solutions for reducing these service gaps.concept review: customers have certain expectations about how a service should be delivered. a service gap occurs when the delivery of a service fails to meet customer expectations. there are four types of service gaps: knowledge gap, standards gap, delivery gap, and the communications gap. it is important for marketers to identify these gaps and develop strategies for minimizing them.match the example or solution to the appropriate service gap category.1. wait for repairs 5. train employees well2. understand expectations 6. incentives for tenants3. do not overpromise 7. family movie night4. empower employees 8. delayed lawn careservice gap example solutionknowledge gap standards gap delivery gap communication gap