One rule of thumb Everstine has is that "if the price seems too good to be true, that should be a red flag". For instance, $3 for a bottle of olive oil or honey in the US might be suspect.
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"It's just a matter of having enough Artemis launches to build the infrastructure on the Moon by then," he adds, referring to Nasa's Artemis spaceflight programme that aims to send people and equipment to the Moon.