Why was Kaifeng the capital of the Central Plains since the beginning of the five dynasties, while Luoyang was ignored?

Why was Kaifeng the capital of the Central Plains since the beginning of the five dynasties, while Luoyang was ignored?
Luoyang: a unique condition

Luoyang: unique conditions

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Kaifeng: the latter comes first


Kaifeng VS Luoyang: economic factors are the most important