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Account Health
Avoiding liquidation risk

# What is Account health?

In essence, Account health is a proportion between your Borrow Limit(Borrow Capacity) and your Borrow Capacity Used.
$BC_{u} = \sum(CF_a * C_{(u, a)} *Deposit_{(u,a)} * Price_a)$
where, for user u and asset a:
CF is asset's Collateral Factor
C is 1 for assets used as collateral, otherwise 0
Deposit is amount of asset deposited
Price is the equivalent asset's price in U.S. Dollars
$\\ BCU_{u} = \sum((Borrow_{(u,a)} * Price_a) / LT_a)$
where
Borrow is amount of asset borrowed
LT is Liquidation Threshold for the asset a.
Altogether,
$AccountHealth_u = 1 - BCU_u/BC_u$

## Special case: Supply and Borrow in the same asset

It's a completely healthy situation to borrow the same asset as the collateral: Depositing amount D and borrowing amount B should effectively be seen as Deposit D-B, but only until Borrow starts exceeding Deposit. In this moment, a healthy account can become burned-out(with total negative saldo) and there's nothing liquidators can do about it.
To prevent that, an overlap_factor is introduced to smoothen the account health formula while still be tolerable with the same deposit-borrow asset:
If
$Borrow_{(u, a)} > C_{(u,a)} *Deposit_{(u,a)}$
Then
$BC_{u,a} =0 \\ BCU_{(u,a)} =( \frac{(Borrow_{(u, a)} - C_{(u,a)} *Deposit_{(u,a)})}{ LT_a} + OverlapCharge_{(u,a)}) * Price_a$
Otherwise
$BC_{u,a} = CF_a *(Deposit_{(u,a)}- Borrow_{(u,a)}) * Price_a \\ BCU_{(u,a)} = OverlapCharge_{(u,a)} * Price_a$
Given
$OverlapCharge_{(u,a)} = min(Borrow_{(u, a)} , C_{(u,a)} * Deposit_{(u,a)}) * overlap\_factor$
Liquidators can liquidate part of your debt when your Account Health goes below 0.

# Why has my Account health changed?

Even if you don't interact with the protocol, your account health is subject to change:
Your Deposit increased or decreased its value
Your Borrows increased or decreased its value
Interest on your deposits/borrows has been accounted.
Your debt has been liquidated in order to increase your account health

# What is liquidation?

Liquidators can liquidate part of your debt when your Account Health goes below 0%. This means, when your Account Health goes below 0%, a liquidator can step in and take up to 50% of your debt for one asset and the corresponding amount of your deposit + premium. The related parameters(Liquidation Threshold and Liquidation Penalty) are listed in "Asset Parameters" section.