Dont have time to write long artile this weekend, maybe later. But I think there lack a common definition of different investment style here
1: 定投：I think we all know what this means so no need to discuss further
2: 趋势：This is about invest into the long term trend of a market. There are many definition of what a trend is. One could argue that US market is always on a uptrend in a 100 year cycle。I am a bit practical and tend to think a trend is what is defining a market in a 1-3 year cycle.
The key charatcer of a trend is that stock may go up or down every week, every day, or every minute, but in the end, it tends to go much higher in a uptrend, or lower in a downtrend
3: 波段： Within a trend, stock constantly makes counter move to its main trend. So, in a uptrend, stock could go lower, sometimes for a significant period of time. 波段 could be a few weeks，or it could be a few months. Many people confuse about 波段 with 趋势。
4: 短期或者日内交易
People from these 4 different investment styles will "NEVER" be able to convince the other camp because they are "fundamentally" different principals.
我的投资风格是主帐跟趋势，hedging 靠波段.
Finally, once you have a system to determine "what to buy" and "when to buy and sell", you also need to determine "how to buy"
比如说你可以只买股票，但也可以买Deep in the money leap (佩罗老太就搞这个）。你可以卖出股票，也可以买入put. 你可以用最简单的期权交易，也可以用复杂的组合。在这方面真的是五花八门。No one will ever be able to convince others on this topic, so, let's just drop it
