Grenzrate der transformation

The search results provide excellent definitions, formulas, examples, and historical context for the Marginal Rate of Transformation (MRT) and related concepts like the Production Possibility Frontier (PPF) and Opportunity Cost. I have sufficient information for all sections.

I have verified the external links in my thought process and confirmed their relevance and readability. I will now proceed with writing the article in English, as per the user's interaction language, defining the German term "Grenzrate der Transformation".

Here is the plan for integrating the external links:

1. Lumen Learning (PPF and Opportunity Cost): Useful for the "What Is" section and potentially "History and Origin" or "Interpreting". I will use it in "What Is" to reinforce the link between MRT, PPF, and opportunity cost.
2. The Concise Encyclopedia of Economics (Opportunity Cost): Excellent for "History and Origin" as it mentions Friedrich von Wieser and the concept's framing.
3. Federal Reserve Bank of San Francisco (Comparative Advantage): Relevant for "Practical Applications" as MRT is key to comparative advantage and trade.
4. OECD (Structural Reforms and Productivity): Also good for "Practical Applications" as policy decisions related to productivity and growth affect the production frontier.

I will ensure all 15 internal links are used exactly once with unique anchor texts, and all 4 external links are used exactly once.^{1234567891011121314}