> For the complete documentation index, see [llms.txt](https://docs.collection.xyz/guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.collection.xyz/guides/technical-reference/bonding-curves/type-of-bonding-curves/linear-curve.md).

# Linear Curve

A linear bonding curve has a straight-line or additive relationship between successive trades and price. As an NFT is bought(sold), the next price it quotes to sell NFTs at will increase(decrease) by a flat amount (known as **delta**).

1. As an item is bought from the pool, the price will increase by a fixed amount. The reverse happens when an item is sold into the pool.
2. For example, if the delta is `0.2`, and the initial price is `1.0`. After someone buys 1 NFT from the pool, the price will be `1.2`. If someone sells an NFT into the pool, the price will be `0.8`.