But, unlike any stocks trading in New York, the Merval surpassed its initial gains to reach its all time maximum value, having gone up 36.6% to 3001.52.

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"Customers should consider whether, despite the initial tempting offers, these accounts offer value over time, " says Kevin Mountford, at moneysupermaket.com.

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An even bigger hit is that the new law locks the artwork's value (for deduction purposes) in at the time of the initial fractional gift.

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