Easier pricing on shop

Need a feature to set prices on a whole tab in shop.

Even better, could we have a feature that lowers the price of items by for sale at periodic interval?

For example, I want to sell an item and I have no reference for the price. My goal is to set a high starting price and decrease the price by 33% of its current value every 48 hours. That would save me alot of time and manipulations. It would also help increase the sales of everyone.

Sometime you would want the price to go down 10% per week.

What do you think?