I'm selling this because I want to try other types. It's been three months since I bought it, but it hasn't decreased much at all. My hair is short, and I use about 0.5 pumps. It lathers up really well (like, really fluffy). I remember the shampoo description originally said that a short haircut could last for 6 months with 0.5 pumps, so it's about that pace. I think there's about 45% left, so I hope that's helpful... The price is set considering shipping and packaging costs.