An investment adviser says the country's economic growth is strong - but international factors might hold us back.

Jason Watson from JMIS Investments says a forecasted surplus this year of 3.1 billion, rising to seven billion by 2022, has us in a good financial position.

But he says it might be a little optimistic if volatile global politics cause any speed bumps.

This could include trade sanctions, rising oil, food and construction costs, or wage or inflation growth here.

Watson told Mike Hosking the Reserve Bank might have to raise rates as a result.

He says if any of these happen, our growth rates will have to be reviewed.

LISTEN ABOVE AS JASON WATSON SPEAKS WITH MIKE HOSKING