True, False, or Uncertain: Decide whether the following statements are true, false, or uncertain. Provide an explanation for your choice that is model based. Meaning you must clearly say what economic model(s) you are using to answer the question. Marks are awarded for your explanation only. Answers with correct "true" or "false" designations but incorrect explanations will receive zero marks. A few sentences or a sentence and a diagram should be sufficient for full marks. (a) A temporary increase in government spending always leads to increased output