# PriceUpdateEvent

**Purpose**: Emitted when the sale price is updated, signaling changes in pricing strategy by the seller.

**Key Inclusions**:

* `sale_id`: The sale being updated.
* `old_price`: The price per NFT before the update.
* `new_price`: The new price per NFT after the update.
* `changed_by`: The address that performed the price update.
* `timestamp`: When the price change occurred.
* `collection_id`: Which collection this sale belongs to.

**Use Cases**:

* Notify watchers that the cost to purchase NFTs has changed.
* Update any listed prices on marketplaces or dashboards.
* Provide historical pricing data for analytics or for buyers waiting for favorable prices.


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