When to use a pointer to another struct in nested structs in C

I'm confused as when should I use a pointer to another struct or contain a copy. For instance, should I use `Products *prods;` or `Products prods;` within Inventory? and how do I `malloc`? typedef struct Products Products; struct Products { int id; char *cat; char *name }; typedef struct Inventory Inventory; struct Inventory { char* currency; int size; Products prods; // or Products *prods; };

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