Add dataset card for Economies of Open Intelligence

This PR adds a comprehensive dataset card for the "Economies of Open Intelligence: Tracing Power & Participation in the Model Ecosystem" dataset.

It includes:
- A brief description of the dataset, derived from the paper abstract.
- A link to the associated paper on Hugging Face.
- A link to the associated project page (Hugging Face Space).
- Relevant metadata, including `task_categories` as `OTHER`, `language` as `en`, and specific `tags` like `model-hub`, `ai-ecosystem`, `data-analysis`, `ai-ethics`, `research`, and `economics` to improve discoverability and classification on the Hugging Face Hub.

This update helps researchers understand the dataset's purpose and find it through relevant categories and search terms.

README.md

@@ -0,0 +1,28 @@
+---
+task_categories:
+- OTHER
+language:
+- en
+tags:
+- model-hub
+- ai-ecosystem
+- data-analysis
+- ai-ethics
+- research
+- economics
+---
+
+# Economies of Open Intelligence: Tracing Power & Participation in the Model Ecosystem
+
+This dataset, released in conjunction with the paper [Economies of Open Intelligence: Tracing Power & Participation in the Model Ecosystem](https://huggingface.co/papers/2512.03073), provides a rigorous examination of concentration dynamics and evolving characteristics in the open model economy.
+
+It compiles the complete history of weekly model downloads (June 2020-August 2025) alongside detailed model metadata from the Hugging Face Model Hub. The dataset encompasses 851,000 models, over 200 aggregated attributes per model, and 2.2 billion downloads.
+
+Researchers can leverage this dataset to analyze:
+- The fundamental rebalancing of economic power in open-weight AI.
+- Statistically significant shifts in model properties, such as increases in average model size, growth in multimodal generation, quantization, and mixture-of-experts architectures.
+- Trends in data transparency and the emergence of developer intermediaries.
+
+The project also features an interactive dashboard for real-time monitoring of these dynamics.
+
+**Project Page:** [https://huggingface.co/spaces/economies-open-ai/open-model-evolution](https://huggingface.co/spaces/economies-open-ai/open-model-evolution)