Gold:
In the context of investments, "gold" typically refers to investing in physical gold or gold-related financial instruments. Gold is considered a precious metal and is often used as a hedge against inflation and a safe-haven asset.

Micro Case:
The term "micro case" is not a standard financial or investment term. It might be a typo or a specific reference to a case study or scenario on a microeconomic level, focusing on the economic behavior of individuals, households, or small businesses.

Small Case:
"Small case" could refer to a concept in investments where a group of stocks representing a specific theme or strategy is bundled together into an investment portfolio. Small cases are pre-defined baskets of stocks designed to help investors achieve their financial goals.

If you have specific questions or if there's a particular context you're referring to, please provide more details for a more accurate response.