即効

1. Origins, structure, and basic meaning

• Structure: 即効 is read as そっこう and is a noun for an effect or result that appears soon after a measure is applied.
• Basic usage: Use 即効がある for possessing an immediate effect and 即効を期待する for expecting one.

2. Common pitfalls and similar expressions

• Speed versus magnitude
  • 即効 concerns how quickly an effect appears and does not guarantee that the effect is large or lasting.
• Immediate result and continued improvement
  • Same-day congestion relief is a quick result, whereas daily review is a longer approach that does not rely on immediate impact.