## Latex source code
- Method 1:
```latex
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
D_{it} =
\begin{cases}
1 & \text{if bank $i$ issues ABs at time $t$}\\
2 & \text{if bank $i$ issues CBs at time $t$}\\
0 & \text{otherwise}
\end{cases}
\end{equation}
\end{document}
```
- Method 2:
```latex
\Big\{
\begin{matrix}
0 & \text{x>0} \\
1 & \text{x<=0}
\end{matrix}
```
$\Big\{
\begin{matrix}
0 & x>0 \\
1 & x<=0
\end{matrix}$
## Reference
- [Multiple lines one side of equation with a Curly Bracket](https://tex.stackexchange.com/questions/337351/multiple-lines-one-side-of-equation-with-a-curly-bracket/337352)
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