Last night I paid my tuition again, originally just wanted to take a small position to ride the rebound, but when I saw the order book was thin I got itchy, and when I placed a market order I was immediately slippage-educated, the transaction price was a bit worse than my target line, and the more I looked at it the angrier I got, so I added another one, completely messing up the rhythm. Others think placing an order is just clicking a button, but when the depth isn't enough, that click is basically giving money away to others. Looking back, it's still the old problem: whether to split the order or not, whether to wait two seconds or not. Recently I've been seeing stuff about social mining, fan tokens, saying that attention is mining... I now think attention is also a cost; staring too long easily leads to impulsiveness. First, I’ll write the rules back: only place limit orders, split orders, and avoid trading when there's no depth. Forget it.