Just In Time (JIT) is a popular admonition to businesses that's meant to focus on the perfect amount of inventory to have.
What is the perfect amount? Zip. Zero. Zilch. Absolutely none.
This approach has failed us, the same way abstinence only education fails us. Perfect adherence to JIT principles is unattainable in practice. We should spend more time talking about reasonable inventory management instead of defaulting to feeling like failures on this topic because we haven't met an impossible goal.