# How Do Concrete Vaults Actually Work?

*You’ve just hit "Deposit" on a Concrete vault. You see your balance shift, you receive some vault shares, and you notice terms like eRate and NAV flickering on your dashboard.

It feels good to see the gears moving, but a nagging question remains: What is actually happening to my money right now? If you’ve ever felt like DeFi is a "black box," you aren't alone. Let’s peel back the lid and look at how Concrete manages your capital under the hood.*

By [susu98](https://paragraph.com/@susu98) · 2026-03-24

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1\. Your Slice of the Pie: Vault Shares & eRate
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When you deposit assets into **Concrete vaults**, you aren’t just putting money into a savings account; you are buying into a collective pool.

*   **The Analogy:** Think of the vault as a giant, ever-growing pizza.
    
*   **Vault Shares:** When you deposit, you receive "shares." These aren't dollars; they are your "slices." Even if the pizza gets bigger, you still own the same number of slices.
    
*   **eRate (Exchange Rate):** This is the magic number that tells you how much "pizza" is in each slice.
    

As the vault earns yield, the slices (your shares) stay the same, but they get "heavier" or more valuable. This is **automated compounding** in action. You don't need to manually reinvest your earnings; the **eRate** simply climbs, meaning when you eventually trade your shares back, you get more assets than you started with.

2\. Understanding NAV: The Total Pool
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You’ll often see **NAV** (**Net Asset Value**) mentioned. Don't let the finance-speak intimidate you.

> **NAV** is simply the total market value of everything inside the vault—the "Total Pool."

*   **The Formula:** $\\text{NAV} \\div \\text{Total Shares} = \\text{Share Price (eRate)}$
    

If the vault has $1,000,000 in it (NAV) and there are 1,000,000 shares, each share is worth $1. If the vault’s strategies earn $10,000 in profit, the NAV becomes $1,010,000. Your shares are now worth $1.01. Your "slice" just grew.

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3\. Active Management: The Chef in the Kitchen
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A common misconception is that **managed DeFi** is passive—that your money just sits there. In reality, Concrete vaults are a hub of **onchain capital deployment**.

Think of the vault as a professional kitchen. You aren't just buying ingredients; you're hiring a **Chef (the Vault Controller)**.

*   **Deployment:** The system looks for the best yield opportunities across the ecosystem.
    
*   **Rebalancing:** If one "dish" (strategy) becomes less profitable or too risky, the Chef moves the ingredients to a better one.
    
*   **Optimization:** The vault handles the complex tasks of harvesting rewards and shifting capital so you don't have to pay the gas fees to do it yourself.
    

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4\. Why Time is Your Greatest Ally
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In DeFi, patience isn't just a virtue; it’s a math requirement. Concrete vaults are designed as long-term growth engines, not "get rich quick" buttons. Here is why **time matters**:

1.  **Harvesting Cycles:** Yield isn't generated instantly. It takes time for the underlying strategies to accrue interest and for the vault to "harvest" those gains.
    
2.  **Smoothing Out Costs:** Every time capital moves (gas fees, execution costs), it costs a tiny bit of the pool. By staying in the vault longer, these costs are offset by the compounding yield.
    
3.  **The Garden Effect:** Think of your deposit like a seed. If you dig it up every two days to check on it, it will never grow. If you leave it, the compounding interest builds momentum, turning small gains into significant growth.
    

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Summary: The Concrete Mental Model
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To keep it simple, remember this hierarchy:

*   **The Vault:** A pooled capital system managed by experts.
    
*   **Vault Shares:** Your proof of ownership (your "slices").
    
*   **eRate:** The current value of one share (the "weight" of the slice).
    
*   **NAV:** The total value of the entire pool.
    
*   **Active Management:** The system constantly rebalancing to capture the best opportunities.
    
*   **Time:** The fuel that drives compounding and maximizes your results.
    

Ready to see it in action? **Explore Concrete at** [**app.concrete.xyz**](https://app.concrete.xyz/) and watch your capital work for you.

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*Originally published on [susu98](https://paragraph.com/@susu98/how-do-concrete-vaults-actually-work)*