A national economy is experiencing a prolonged period of weak growth. Economic data reveals that corporate investment is stable and exports are strong, but household savings rates are at a record high and retail sales have been declining for several consecutive quarters. Consumer confidence surveys show widespread pessimism about future personal finances. The government is debating two primary stimulus proposals. Analyze the scenario and evaluate which proposal is more likely to be effective at reviving aggregate demand in the short term. Justify your reasoning.

Proposal A: A multi-billion dollar initiative to fund the construction of new airports and high-speed rail networks.

Proposal B: A program providing direct cash payments to all households, combined with a temporary suspension of the national sales tax on consumer goods.