![Elena](https://img.btcc.com/btcc/qa/Elena.png)
What is the theory of devils?
I've heard about devils in different cultures and religions, and I'm curious to understand the theory behind their existence. What exactly is the theory of devils?
![What is the theory of devils?](https://img.btcc.com/btcc/qa/qaimg108.png)
![KimonoGlory](https://img.btcc.com/btcc/qa/KimonoGlory.png)
What is the 20-60-20 rule?
I've heard about a financial strategy called the 20-60-20 rule, but I'm not sure what it entails. Could someone explain what this rule is and how it can be applied in personal finance or budgeting?
![What is the 20-60-20 rule?](https://img.btcc.com/btcc/qa/qaimg1450.png)
![CoinPrince](https://img.btcc.com/btcc/qa/CoinPrince.png)
What is the concept of incentives?
I am interested in understanding the concept of incentives. Could someone explain what incentives are and how they work in various contexts?
![What is the concept of incentives?](https://img.btcc.com/btcc/qa/qaimg255.png)
![Giuseppe](https://img.btcc.com/btcc/qa/Giuseppe.png)
What is the concept of elasticity?
I'm trying to understand the concept of elasticity. I know it has something to do with how sensitive something is to changes, but I'm not sure exactly what it means in an economic context.
![What is the concept of elasticity?](https://img.btcc.com/btcc/qa/qaimg366.png)
![ShintoSanctum](https://img.btcc.com/btcc/qa/ShintoSanctum.png)
What is the basic principle of opportunity cost concept?
I want to understand the fundamental idea behind the concept of opportunity cost. What is the CORE principle that defines this economic theory?
![What is the basic principle of opportunity cost concept?](https://img.btcc.com/btcc/qa/qaimg1467.png)