Most people have yet to here of Marley Coffee either. I used the same source that you used when you claimed MC was the top seller for real cups. As you mentioned, MP is private and does not release numbers, I just highly doubt MC is outselling Tim Horton's or Martison(another 100 year old company.) Although I believe they will be the premiere brand for MP, it's going to take some more time.
Although sales have been flat, this is only temporary and they should start increasing. I do expect they will reach 10 million for the year.
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