What(if any) is the significance of Daily World Coin Prices?

Just curious as I saw today that the Walking Liberty Half Dollar had jumped to $102.00 when it was something like $88 a couple of weeks ago.
Wednesday's Coin Prices
Morgan Silver Dollar $114.00 $123.00
Peace Silver Dollar $114.00 $132.00
Walking Liberty Half Dollar $102.00 n.a.
$20 Liberty Gold Type III $3580.00 $3900.00
$20 St Gaudens, motto $1075.00 $1130.00
Wednesday's Coin Prices
Morgan Silver Dollar $114.00 $123.00
Peace Silver Dollar $114.00 $132.00
Walking Liberty Half Dollar $102.00 n.a.
$20 Liberty Gold Type III $3580.00 $3900.00
$20 St Gaudens, motto $1075.00 $1130.00
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