---
title: "What is the default bid rule?"
slug: "what-is-default-bid-rule"
updated: 2022-10-01T21:31:56Z
published: 2022-10-01T21:31:56Z
canonical: "docs.scaleinsights.com/what-is-default-bid-rule"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.scaleinsights.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What is the default bid rule?

The default bid rule analyzes ad group performance and adjusts their default bids to achieve your target ACOS.

**Navigation:** Automation > Default Bid Rule

![default-bid-algo.png](https://cdn.document360.io/f0238742-849b-4f29-9812-9b4fe8e273b6/Images/Documentation/default-bid-algo.png)

---

It is designed mainly for **legacy auto campaigns** that do not have the 4 targeting groups (close match, loose match, substitutes, complements).

![](https://cdn.document360.io/f0238742-849b-4f29-9812-9b4fe8e273b6/Images/Documentation/no-targeting-clause.png)

If your auto campaigns have these 4 targeting groups, consider using the **bidding algorithm** to optimize performance for more granularity and control.

![targeting-clause](https://cdn.document360.io/f0238742-849b-4f29-9812-9b4fe8e273b6/Images/Documentation/targeting-clause.png)