Thais are unable to account for almost three-quarters of their expenses - or more than Bt60,000 a year - due to "mystery spending", according to Visa.
Mystery spending is not from misplaced or stolen cash, but cash spent that the consumer is unsure of where it went.
Its recent online survey showed that on average, Thais spend Bt1,588 weekly but lose track of Bt1,143, or 72 per cent. Most believe their mystery spending went on buying food and groceries, and snacks (both 49 per cent), and non-essential items (45 per cent).
More than a third thought their daily lunch mysteriously ate up a large chunk of their expenses, well above the regional average of only 21 per cent.
Those 18-24 years of age were more likely to mystery-spend on entertainment (45 per cent) than older groups, though the amount of Bt1,091 was on par with all age groups.
In Southeast Asia, Thais were the biggest mystery spenders (72 per cent of respondents) followed by Indonesia (57 per cent), Vietnam (48 per cent), Singapore (45 per cent), Malaysia (44 per cent) and the Philippines (42 per cent).
PASSENGER NUMBERS RISE
Airports of Thailand (AOT) saw increases of 21.9 per cent in the number of passengers to 106.79 million and 16.0 per cent in aircraft movements to 707,362 flights through its six international airports in its fiscal year ending September 30. The number of international passengers climbed 19.8 per cent to 61.34 million and the number of domestic passengers increased 25.0 per cent to 45.45 million.
Of total flights, 365,321 were international and 342,041 domestic.
The six airports are Suvarnabhumi, Don Mueang, Phuket, Chiang Mai, Mae Fah Luang Chiang Rai and Hat Yai.