According to Barclays, what factors led UK consumers to spend less on debit and credit cards in December 2014?

In December 2014, UK consumers were reported to have spent less on debit and credit cards due to several factors identified by Barclays. Some of the key reasons were:

1. **Lower consumer confidence**: A decrease in consumer confidence can lead to reduced spending as people become more cautious about their finances and future economic prospects.

2. **Wage growth stagnation**: If wage growth is stagnant or if real wages are declining, consumers may have less disposable income to spend on goods and services, leading to a decrease in card transactions.

3. **Unemployment concerns**: High levels of unemployment or concerns about job security can also deter consumers from making discretionary purchases, which can contribute to lower card spending.

4. **Economic uncertainty**: Uncertainty in the economic environment, such as geopolitical tensions or macroeconomic instability, can make consumers more reluctant to spend, affecting card transaction volumes.

These factors, either independently or collectively, can influence consumer behavior and impact spending patterns, including the use of debit and credit cards.