How do marriages work in different countries, who pays the bill? Bride and groom or their parents?

In my country mostly parents pays the bill but i think it's bride and grooms thing so only they should pay. What do you think?
I was wondering that how marriages work in different countries..like who pays the bill? Bride and groom or their parents??
How do marriages work in different countries, who pays the bill? Bride and groom or their parents?
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