Depends on what you're selling, how complicated the pricing structure is and whether price is likely to be a major factor in people saying "yes" to your product.

And above all whether the goal is to get people to click the "buy" button, to get people trying the service to see how much they might need it or to get people to contact your enterprise sales team

I feel like most of the time, pricing decisions involve a lot of information and it feels like a digression to have it all on one page. For simple apps and pricing structures, it's doable — my Rdio-to-Spotify app was $5, and said so up front – but the point of the landing page is to help someone decide if you're useful to them or not. Get them to the "yes, if" stage before showing them pricing, imo.

Be upfront with your price.

Price is a data point a customer needs to make the decision.

Give them all data points you can.

Like andkon said, convince me that your product is something I need or compel me to need it. I might hit your landing page with little to no prior information.

If I can't be convinced your product is worth my time, does price even matter at that point?