投稿日:2025年9月26日

The Showa-era idea that “inventory is bad” is destroying the supply chain

Understanding the Showa-era Concept of Inventory

The idea that “inventory is bad” has its roots in the Showa era of Japan, a period that spanned from 1926 to 1989.
During this time, the Japanese economy experienced rapid growth and transformation.
In the automotive industry, in particular, practices such as Just-In-Time (JIT) manufacturing were developed and popularized.
The aim was to reduce waste and increase efficiency, fostering a production system that minimized the amount of inventory at any given time.

In those days, holding inventory was seen as an unnecessary cost.
Warehousing items meant higher storage costs, a risk of damage or obsolescence, and capital being tied up in materials that couldn’t yield immediate returns.
Reducing inventory was synonymous with operational efficiency and financial prudence.
Manufacturers aimed to synchronize production closely with demand to achieve this lean operation mindset.

The Modern Supply Chain Landscape

As time has advanced, so too has the complexity of global supply chains.
With the interconnectedness of international markets, supply chain management has become a sophisticated discipline.
However, the wholesale adoption of the “inventory is bad” idea presents challenges in today’s environment.

Today’s supply chains face a myriad of risks that require a more nuanced understanding of inventory management.
Globalization, technological advances, and shifting consumer expectations demand flexibility and resilience.
Therefore, while the principles of reducing waste and improving efficiencies are still relevant, strict adherence to minimal inventory can be counterproductive.

The Demand for Resilience

Global supply chains must now contend with a number of uncertainties, including geopolitical tensions, tariffs, natural disasters, and pandemics.
Such factors can disrupt the smooth flow of goods and services across borders, creating bottlenecks and shortages.
In these unpredictable environments, holding some level of inventory can serve as a buffer to absorb shocks and ensure continuity of supply.

Businesses that operate with minimal inventory levels are at risk of being unable to meet demand fluctuations promptly.
If supply lines are disrupted, organizations may be forced to delay shipments or halt production, leading to dissatisfied customers and lost sales.
Thus, while reducing inventory holds financial appeal, its role in maintaining supply chain resilience cannot be overlooked.

Adapting to Consumer Behavior

Consumer expectations have also evolved significantly since the Showa era.
Today’s consumers demand goods faster and with more customization.
E-commerce has reshaped shopping practices, prioritizing speed and availability.
Businesses are expected to meet demands for rapid delivery and vast product selections.

To accommodate these demands, some companies have opted to maintain higher inventory levels, strategically positioning products closer to customers.
In this context, inventory serves not as a cost burden but as a strategic asset to agilely respond to market demands.
Companies can quickly fulfill orders and maintain a competitive edge by ensuring they have the necessary products ready to meet customer needs.

The Repercussions of an Outdated Mindset

Clinging to the outdated idea that “inventory is bad” means overlooking the valuable role inventory can play in a modern supply chain.
It can lead to a narrow focus on cost-cutting at the expense of customer service, potential market share, and brand reputation.

Further, it may stifle innovation.
Organizations that rigidly adhere to minimal inventory might lack the flexibility to experiment with new product lines or respond to emerging trends swiftly.

By failing to adjust to the reality that inventory can be a strategic component of a robust supply chain, companies risk falling behind competitors who have adopted more flexible approaches.

Embracing a Balanced Approach

It is crucial for businesses to shift toward a balanced approach to inventory management that aligns with current industry standards and market conditions.
This doesn’t mean disregarding efficiency but rather incorporating a level of inventory that supports flexibility and responsive service.

Technological investments can aid in this transition.
Advanced analytics and AI-driven insights can help businesses forecast demand more accurately and optimize inventory levels proactively.
Automation in warehousing and logistics can further reduce costs and enhance the responsiveness of the supply chain.

By leveraging technology, businesses can gain greater visibility into their supply chains, making data-driven decisions that balance the benefits of reducing inventory with the necessities of maintaining adequate levels to meet demand.

Conclusion

The Showa-era principle that “inventory is bad” was a product of its time, suitable for the economic climate and technological landscape of the era.
In today’s dynamic global market, however, its indiscriminate application can be detrimental to supply chain stability and business success.

Organizations must embrace a more flexible, nuanced understanding of inventory’s role in the supply chain.
This involves recognizing inventory as a vital element for ensuring resilience, meeting consumer expectations, and sustaining competitive advantage.

By adapting inventory management practices to the modern context, businesses can effectively navigate the complexities of global supply chains and thrive in an ever-evolving marketplace.

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