---
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/40111048.md"
description: "y only knows theory but not practice....If you want to buy Tesla call options and at worst end up taking delivery of the underlying shares, is the only loss just the premium?"
datetime: "2026-04-22T16:53:50.000Z"
locales:
  - [en](https://longbridge.com/en/topics/40111048.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/40111048.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/40111048.md)
author: "[新用户_j9bjKs](https://longbridge.com/en/profiles/14685346.md)"
---

# y only knows theory but not practice....If you wan…


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## Comments (4)

- **启明俊 · 2026-04-22T16:59:20.000Z · 👍 1**: One option contract covers 100 shares of the underlying stock.
  - **新用户_j9bjKs** (2026-04-23T00:26:38.000Z): I know this, I just don't understand premium very well.
  - **新用户_j9bjKs** (2026-04-23T00:28:01.000Z): Excuse me, if I buy 100 shares and then the price falls, and I buy one put option, can that lower my cost basis?
  - **启明俊** (2026-04-23T02:10:05.000Z): Right