Volatility and Investment: The phenomenon where an asset’s price fluctuates over time is called volatility. Owning and reselling this volatile asset is known as an investment. The concept of buying and reselling an asset often causes us to overlook the fact that this process involves a trade-off between low-volatility and high-volatility assets. Cash is less volatile than stocks, and stocks are relatively more volatile. In other words, investing involves exchanging low-volatility assets for high-volatility assets and then switching back to low-volatility assets. Meanwhile, surplus profit is generated by the price differences caused by volatility. What would happen if we traded only highly volatile assets with each other? We would probably hesitate to exchange assets and might refrain from investing. In investing, there must be both low-volatility and high-volatility assets. - Joseph’s “just my thoughts”
For the security of the Internet service, we have been asked by the Internet service companies to set the password combined by more than 8 or 10 "uppercase letter+lowercase letter+number+special character". But it was obviously of no use. This security guideline was recommended by Bill Burr who worked at NIST in the USA, he suggested this way in his report. Furthermore, the user was required to change the initial password set regularly. Despite this measure, the best way of security to protect users' accounts was the notification of the alarm for attempted hacking when the hacker tried. We have only tried to change the keys despite the simple method meanwhile. Today, the world has begun to comprehend that the security problem is not encryption or confidentiality, but simply cyber-dominion control and communication. - Joseph's "just my thoughts"