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

# How Oikos grows the book

> Oikos runs your connected web book — choosing the next motion for each subscriber, on surfaces you own, and compounding the result.

Migration keeps bringing your store book home. Oikos is the engine that grows it once it is here — every subscriber Nostos moves to web, and everyone you acquire there — by choosing the next motion for each one.

## Acquire

Win subscribers directly on web, on your own rail — with no store fee to pay.

## Retain

Keep them paying — recovery, save flows, and win-back run across the book.

## Grow

Expand each subscriber — the right upgrade or offer, at the moment it lands.

## One subscriber at a time

Every motion is chosen per subscriber by [Kairos](/docs/getting-started/kairos-decisioning), runs on [surfaces you own](/docs/product/subscribers), and is measured first-party — so the book keeps [compounding](/docs/opportunity/margin-compounding).