総需要・総供給(AD-AS)

The AD-AS model describes how total demand and total supply determine the overall price level and output in the economy. It specifies the unit of analysis and the assumptions behind shifts in demand or supply, including price stickiness and ceteris paribus. The concept separates what is in scope (overall output and price level) from what is out of scope (sector-specific effects), so comparisons stay consistent. Applied well, it turns a vague debate into a measurable choice and makes the drivers of results explicit.

Aggregate Demand and Aggregate Supply (AD-AS) needs a clear start point, end point, owner, and exception path. Start | Trigger condition and input | Prevents premature work End | Output and acceptance rule | Prevents unfinished handoff Exception | Escalation path and decision owner | Prevents stalled execution

Aggregate Demand and Aggregate Supply (AD-AS) improves when ownership, cadence, and feedback loops are explicit. Ownership | One accountable owner | Reduces coordination loss Cadence | Regular review rhythm | Detects drift early Feedback | Clear signal from users or operators | Turns process into learning

Use AD-AS to decide macro policy responses, because it exposes demand and supply shifts and the trade-off with output versus inflation. It changes budgeting and prioritization by making price stickiness and ceteris paribus assumptions explicit and reviewable. It informs adjustments when demand shocks or supply constraints change, so the decision stays grounded in current conditions.

• Use AD-AS to decide macro policy responses, because it exposes demand and supply shifts and the trade-off with output versus inflation.
• It changes budgeting and prioritization by making price stickiness and ceteris paribus assumptions explicit and reviewable.
• It informs adjustments when demand shocks or supply constraints change, so the decision stays grounded in current conditions.

• Define the unit and time horizon before comparing AD-AS shifts across options.
• Track the primary driver (AD/AS shifts) separately from secondary noise.
• Run sensitivity checks on multipliers and supply elasticity to avoid false precision.
• Document data sources and calculation steps so results are auditable.
• Revisit the model when the business model or market context changes.

Treat Aggregate Demand and Aggregate Supply (AD-AS) as an operating system, not a one-time activity. Do not add process without removing ambiguity. Do not measure activity if the output quality is unclear. Do not scale the process before the owner and exception path are stable.

• Do not add process without removing ambiguity.
• Do not measure activity if the output quality is unclear.
• Do not scale the process before the owner and exception path are stable.

An energy shock reduces supply, shifting AS left. Policymakers model a 1% output loss and a 1.5% price increase, then compare broad stimulus versus targeted relief. The analysis shows broad stimulus would amplify inflation, so they choose targeted rebates and energy efficiency subsidies. After implementation, they reassess AD-AS assumptions as energy prices normalize.

Compare Aggregate Demand and Aggregate Supply (AD-AS) with adjacent concepts before deciding. Aggregate Demand and Aggregate Supply (AD-AS) | Current concept | Use when the team needs the primary decision lens Adjacent metric or framework | Supporting lens | Use when the team needs evidence or process detail General vocabulary | Broad explanation | Use only for orientation, not final decision-making

• AD-AS is not a precise forecast; it is a simplified framework.
• Short-run and long-run outcomes can differ materially.
• The model does not capture distributional impacts.