I'm about to get real snarky here:
Way to not get the point of the model.
But yes, an ocean. That you can't communicate over, and it takes a
week to get to the closest island.
If the 20 mile limit is 1/6th of that distance, then 1 week of travel
(our parsec equivalent) is 120 miles.
How many parsecs are between New York and China?
About 56 if you're heading for Beijing.
It's about 24 if you want to get to Los Altos, where Apple was founded.
You can fit 12,931 iPhone's, in their packing boxes, per dTon. A
shipping crate would drop usable volume to 95%, so 12,284. It's
$700/unit, shipping from Beijing would add $4.55 to unit price (if it
was Jump-1 all the way) - but the total order would take 2 years and 8
weeks, from placement of order, so... Courier costs get added in.

On 2/12/18, Tim <xxxxxx@little-possums.net> wrote:
> On Mon, Feb 12, 2018 at 11:30:11AM -0800, Rusty Witherspoon wrote:
>> Now, let's take New York, and modify the model to reflect Traveller.
>> Radio, cell phones, internet, they all work within... Oh, let's say
>> 20 miles of the geographic center of NYC. You want something from
>> within that circle, you can get easy. At the 20 mile limit, there's
>> a wall.
>
> Or an ocean.
>
>
>> Now, let's get those Chinese iphones...
>
> Over the ocean, which is exactly what happens.
>
>
> - Tim
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