The TT Board said in a MotoGP statement on Thursday that the change would bring more spectators to the event and increase media exposure.
"The decision to move the race to Sunday was made out of sheer necessity," it said. "The number of motorcycle grands prix around the world is limited, and often there is more capital available elsewhere to obtain a MotoGP licence.
"In this competitive environment, the TT Assen can only hold its own by increasing the number of visitors. With an increase in the number of visitors, the Board expects the turnover of the TT to increase by 5-10 percent in the medium to long-term."
(Reporting by Alan Baldwin in London, editing by Ken Ferris)
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