Poka-Yoke: The "Mistake-Proofing" Strategy From Toyota Factories to the Investment World /By Longtunman
In the world of investing, no matter how deeply we analyze or how mindful and cautious we are, there is always a chance that mistakes will occur.
This means that for every investment, besides focusing on generating returns, minimizing risk as much as possible is also a core heart of investing.
One principle we can apply is "Poka-Yoke" or "Mistake-Proofing," which originated in the industrial manufacturing sector.
So, what exactly is Poka-Yoke, and how can it be applied to investing?
Longtunman will explain.
The principle of Poka-Yoke (pronounced Po-ka Yo-ke) was invented by a Japanese engineer for use in Toyota's production system.
The core concept of Poka-Yoke is a system or tool designed to reduce Human Errors as much as possible, aiming to decrease the number of defective products and ensure workplace safety.
Its operational principle is to provide alerts and prevent potential mistakes before they happen.
For example, safety sensors detect whether a person is in the work area before a machine is ordered to operate, reducing the chance of accidents.
Another example is a machine's component slot designed with a specific shape to lock the orientation of the part being fed, preventing it from being inserted incorrectly.
If we look at Poka-Yoke principles applied in daily life, we see things like:
- Mobile SIM card trays designed to prevent inserting the card the wrong way.
- Automatic transmission systems in cars that require the brake pedal to be pressed before shifting gears.
So, what does Poka-Yoke look like in the world of investment?
There are several tools aligned with the Poka-Yoke concept that we can use in our investment journeys.
The first tool is Diversification.
"Don't put all your eggs in one basket" is the classic phrase regarding diversification. If that single basket is damaged, all the eggs inside could break.
Since different assets carry different risks—where high returns usually come with higher risks, such as tech stocks or digital assets—diversification is key.
Whether it is spreading investments across various asset classes, different countries, or even multiple companies.
(However, these must be companies we truly understand and are not too numerous for us to effectively track their performance.)
This is one way to reduce the chance of error from miscalculating a specific stock or asset, making it much safer than putting all your money into a single investment.
The next tool is the Margin of Safety.
Margin of Safety is the difference between the intrinsic value of a stock we have calculated and the price we actually pay.
For example, if we estimate the fair value of a stock at 100 Baht and set a Margin of Safety of 30%, it means we will only buy that stock when the price drops to 70 Baht.
The Margin of Safety acts as a buffer to reduce risk in cases where we might have misvalued the stock or when unexpected events occur.
The higher the Margin of Safety we have, the greater the investment safety becomes.
Conversely, if we secure a large Margin of Safety and the investment performs well, we might achieve returns even higher than expected.
Another equally interesting tool is Dollar Cost Averaging (DCA).
This is a method where we invest a fixed amount of money consistently on a monthly (or quarterly, weekly) basis.
With this method, when asset prices are low, investors will acquire more units. When prices rise, they will acquire fewer units.
This helps ensure that the overall average cost of the assets we invest in isn't too high, as the costs are averaged out over time.
However, for DCA to work, we must have discipline and be confident that the asset we are investing in will grow in the long term.
DCA helps investors avoid the need to "time the market," which has a very high chance of error—especially for beginners who may not yet be experts.
These three tools are examples of "Poka-Yoke" or mistake-proofing mechanisms in the investment world that investors can apply.
To recap, the main investment tools based on Poka-Yoke principles consist of:
1. Diversification: Reduces errors caused by the over-volatility of any single asset.
2. Margin of Safety: Reduces errors from misvaluation or unforeseen events.
3. Dollar Cost Averaging: Reduces errors related to market timing or price fluctuations.
Beyond these three, we can even invent our own new tools to suit our personal investment styles.
But the most important thing is that we must have the discipline to use these tools. For instance, if you set a Margin of Safety at 30%, you should consistently stick to that principle.
This ensures that Poka-Yoke can effectively help protect, alert, reduce bias, and minimize investment mistakes.