# Market Orders

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## **Market Long**

A market‐order buy that immediately opens a position at the best available price // use when you want instant execution.

* **Market** tab: Executes immediately at the best available price.
* **Buy / Long** (green): Opens a bullish position (you profit if price rises).
* **Price 45.86**: The current mark price of the contract.
* **↻ Last price** button: Refreshes the price field to the latest mark.
* **50 vUSD**: Collateral committed (out of your 100 vUSD balance).
* **Half / All** shortcuts: Fill the input with 50% or 100% of available collateral.
* **Slider (0–100%)** with 25 / 50 / 75% ticks: Adjusts the fraction of collateral deployed.
* **Value 5,000 vUSD**: Notional size (= Price × Quantity).
* **Cost 50 vUSD**: Collateral locked to support the position.
* **Buy / Long** button: Submits the market buy order.
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## Market Short

A market‐order sell that immediately opens a bearish position at the best available price // use when you want to short the asset right away.

* **Market** + **Sell / Short** (red): Immediate execution of a bearish bet (you profit if price falls).
* **Price 45.86**: Entry price field set to the mark price you’ll sell at.
* **Collateral, slider, Value/Cost** function identically to Market Long.
* **Sell / Short** button submits the market sell order.
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