A regular Big Mac already has plenty of fat, salt, sodium & calories.
Now McDonalds ups the ante and puts on two more slices in an attempt to add more inches to the waistline of those skinny Germans. It sells this burger for 3.50EUR (approx. 3.70USD).
Where I live, they sell the regular Big Mac for $6.60 USD, includes tax and 3.50EUR buys you just a McDouble. In other parts of the US, they may sell for less.

This Double Big Mac is not available in the USA -- seems the waistline there already is large enough to meet McD's goals.

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Screenshot from www_mcdonalds_de